Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f3e87c146df613e…

MALICIOUS

PDF

76.9 KB Created: 2021-03-17 19:34:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: bdf4fe1352801cb8f462dcd4f454b0e4 SHA-1: 1250871abe03060f92bd294b97e5698aff3ab51a SHA-256: 3f3e87c146df613ec3be28d2c6672d74eb4c33b529e49b1270e0bca3a60e1426
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which are hosted on disposable domains or redirectors, indicating a link farm designed to host malicious content. The presence of a URL like 'soxebez.ru' and the ML classifier flagging it as malicious strongly suggest a phishing or scam attempt. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to distribute malware or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://soxebez.ru/strik?utm_term=how+do+i+take+my+ged+test+during+covid+19 PDF link annotation
    • http://vwwv-avito.online/why_did_walmart_fail_in_germany9i3uz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486743/normal_5feb1dfe26514.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427267/normal_60152ad0280ed.pdfIn PDF document text
    • http://ellmax-site.xyz/15364709901ijbuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460076/normal_5fdc1f26bb45f.pdfIn PDF document text
    • http://ludshop.xyz/23133493980rv9we.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453528/normal_5ffe133fd84b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375698/normal_603a5a002729d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d111bfa-ce9a-4574-9de3-ca68c223ef85/mefamat.pdfIn PDF document text
    • https://41d9b059-0b17-466b-96e6-f31a3f3e9b19.filesusr.com/ugd/f1ead9_2ce293a21960406290442b86930a1c6c.pdf?index=trueIn PDF document text
    • https://1d812fcc-cfc3-4558-a870-56fc5b7f4c2e.filesusr.com/ugd/754d94_95707805f46b428c89da16f622e61ae0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/11a8b82f-fecb-40ef-b844-3fb7c208ec25/telawigarabot.pdfIn PDF document text
    • https://979cd01f-16ea-4d2c-b189-234964c95597.filesusr.com/ugd/d4c4cf_5e51c370e7954c26a0871eee3223c242.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba1b4cb4-70d1-42b5-a2e9-05f17346f7c2/what_is_the_area_under_a_speed_time_graph.pdfIn PDF document text
    • https://5e73d190-47a4-4ead-99bf-7e9069f06a16.filesusr.com/ugd/55cc32_76e5ddbd19e645879eaf9d6fa6d819c9.pdf?index=trueIn PDF document text
    • https://17a6c5a8-0587-4adf-8126-5b439e15a62f.filesusr.com/ugd/54bec1_efd4e5ea5fbb45c89a242f3cd12c3061.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ccfef3b-d211-4c7b-be78-637e41352ce7/jatoxozanopuwax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fbffa8c-3f7f-45f8-b00c-4bbbc91eb3e5/muzajunanof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a032084b-9529-42ad-b295-3e9a1d0e18b7/23734143712.pdfIn PDF document text
    • https://45e41439-46a4-4c97-84f0-155cfeda4cef.filesusr.com/ugd/9d7ad9_916b620cf79e4e66bf7bbc600602136f.pdf?index=trueIn PDF document text
    • https://3a5aa097-47f9-475f-9992-83bceef25cc3.filesusr.com/ugd/f55bec_3087294164f0484e94a5c64b67352950.pdf?index=trueIn PDF document text
    • https://50b7e5d6-ab0e-41ff-bbcb-47d024e5c277.filesusr.com/ugd/45d8ab_660bcf41320146579862075408a41a2d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/316b453e-8a51-4967-a18e-7c81271d67d2/guitar_chords_book_for_beginners.pdfIn PDF document text
    • https://b4140449-9b96-4148-8619-c9b3eed7b48c.filesusr.com/ugd/c33cdb_a66e6bc985e64835880d66fb8a58f2b8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecc6c826-ef7b-48ca-b199-0009a976c83b/43554494229.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a664500-af3d-4b17-a420-ea63140ae518/rukoleteparufajawajiroxix.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF56 5712 bytes
SHA-256: 4d55d68e704248886eff708d8797b5b0446df6f87dfd0ba778c592ea877f4e6b
font_01_sfnt_off000102d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D9 10284 bytes
SHA-256: 1db2dacc75843fd277913addfb1c315aa546dac01230c7b8669a21e2e8543e4c

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