Malicious PDF — malware analysis report

Static analysis result for SHA-256 c70e52e48aa08bfb…

MALICIOUS

PDF

72.1 KB Created: 2021-03-15 23:07:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: baab74f96f9c4548685d873d2adbf1bd SHA-1: b8e345a33aadcb08ce749d2c4455071cd35ba4b0 SHA-256: c70e52e48aa08bfb439b6c56f9bc58fd79348dc7794365ff1d7764b822aeb853
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://golowaki.ru/wix?keyword=vrchat+third+person+mode PDF link annotation
    • http://vosojivaru.mypressonline.com/algebra_1_practice_tests.pdfIn PDF document text
    • http://birebap.scienceontheweb.net/call_of_cthulhu_character_sheet_example.pdfIn PDF document text
    • http://nutosuvitiraj.scienceontheweb.net/98198194327.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://41c240d9-b4af-4f88-8fa4-2a41cce3a287.filesusr.com/ugd/01bc73_a9b812259d6046979c77a1c89723baf6.pdf?index=trueIn PDF document text
    • https://780c8f77-0f51-49ab-8dd1-60a90eb210a4.filesusr.com/ugd/1b8612_05fdb3bab60a4b0c9a290e0b75458790.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5ddbadc-2902-4519-98b6-fb83f0eb0cfc/57365577687.pdfIn PDF document text
    • https://60659a61-a27b-47ea-8eac-a81775c62269.filesusr.com/ugd/7a7fb1_0d7d1323c2974cbea65a9e26469d3a6f.pdf?index=trueIn PDF document text
    • https://b6de9e3f-c562-4e05-b5ee-70895c8060ae.filesusr.com/ugd/3801ff_19a6060b3c0844b1a3ce411459cd24ad.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/63798617-f2ee-421a-835f-cdaf0427e488/mp250_how_to_scan.pdfIn PDF document text
    • https://ef90beaa-bca2-431e-862c-49c19dd94618.filesusr.com/ugd/06497e_5e4bdb1af6ea4469a8229ffe61ca20ef.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc0cc1d7-8031-4a31-bee1-f17a45dc2bf0/shiva_sutras_quotes.pdfIn PDF document text
    • https://24218389-b518-4ca3-8548-65eaf758daa4.filesusr.com/ugd/c836c3_3d7b735e62284018ac06f9619d40f344.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b70c22d9-7aba-4ff2-a569-40a04a5bfa69/35500217958.pdfIn PDF document text
    • https://977e9bd2-40c7-4150-853a-d4bf381d717f.filesusr.com/ugd/fe0276_509770f2a14044b78b4c9b9d556c2312.pdf?index=trueIn PDF document text
    • https://0cc2a7d0-6f33-4335-9ec9-554d9418487e.filesusr.com/ugd/cb4a18_1af37bcaa386475ea0896d577593fc60.pdf?index=trueIn 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_off0000dcc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC7 5248 bytes
SHA-256: 4736bdfbed232be81c007cf41fed2d2b3f0caca647285f1d669ecdfde514cf57
font_01_sfnt_off0000ee7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7A 10976 bytes
SHA-256: 099f4f02ede9e392a86d25e33d121c822ef8bef31bf2272e28dcf17d35ed85ff

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