Malicious PDF — malware analysis report

Static analysis result for SHA-256 042bb01b3d25d3ae…

MALICIOUS

PDF

78.3 KB Created: 2021-04-16 20:04:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 97dd6e799a4ca6058af3560af9c4fd34 SHA-1: 14cf603f46baa6056e22edf35d920d4b1f6ef75d SHA-256: 042bb01b3d25d3ae38e830e697f2729e661aca427a4d16738c42619d3563b47e
186 Risk Score

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 0.9997

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://xezojetit.ru/strik?utm_term=how+much+is+a+spay+or+neuter+for+a+dog PDF link annotation
    • http://wutopezogegusi.getenjoyment.net/motorola_cp200d_battery_removal.pdfIn PDF document text
    • https://cdn.sqhk.co/bepemuno/WZMLl9T/56914266840.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449603/normal_600fb50c17acf.pdfIn PDF document text
    • https://dakikizubebara.weebly.com/uploads/1/3/4/8/134889455/68c62.pdfIn PDF document text
    • http://radogomi.mygamesonline.org/best_call_of_cthulhu_rpg_books.pdfIn PDF document text
    • https://cdn.sqhk.co/saligoliti/DjPgjFl/all_nhl_games_postponed.pdfIn PDF document text
    • http://zujoxuxosaja.getenjoyment.net/takeve.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376606/normal_606e57f1ef02f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388156/normal_6061b83f12244.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379626/normal_6016c504d29e2.pdfIn PDF document text
    • https://ginamelemu.weebly.com/uploads/1/3/4/6/134624442/9945773.pdfIn PDF document text
    • https://cdn.sqhk.co/fumamijiti/mD31d1L/ap_computer_science_ab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6d4a8fb0-9a8a-4850-8aa1-2b5706121c9a.filesusr.com/ugd/ff2e72_c7594c81fd644d0880f86e401ee57783.pdf?index=trueIn PDF document text
    • https://65f7c47b-6fa2-4aed-9649-637438a88329.filesusr.com/ugd/8fb471_bffd14fd0837437c959a79e7a036d593.pdf?index=trueIn PDF document text
    • https://625f08e2-3d8e-45b5-8e8c-b95d001c5c7c.filesusr.com/ugd/d94ae5_19b13d965d2a43a29a5e1425399fa1b2.pdf?index=trueIn PDF document text
    • https://85ed388a-52e0-4e79-9737-9d4b769dda71.filesusr.com/ugd/bb10c5_fcb13493ecbd4bd8ad8341c4ccb79ed1.pdf?index=trueIn PDF document text
    • https://9764c975-acb6-4bd5-a3ff-b1f4624bc9bc.filesusr.com/ugd/5bcb7b_9a1f3ca95904479da60e882b0a136014.pdf?index=trueIn PDF document text
    • https://a3de454e-1598-42bb-a259-4eb69c42f179.filesusr.com/ugd/fb5067_678fdb4082f14b73b0f4f88f861f5edb.pdf?index=trueIn PDF document text
    • http://fidegaf.atwebpages.com/korean_characters_chart.pdfIn PDF document text
    • https://c8d0f166-86fd-441b-8df5-aa5e6c6c7644.filesusr.com/ugd/f4b3af_56a78be41b4843b6a26f726ee2a37f2b.pdf?index=trueIn PDF document text
    • https://89e5ed4a-33eb-42a6-b5f1-9fc07ea1e15b.filesusr.com/ugd/ff68bb_65f70177240f4e64b9c9ff10c716f0ac.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_off0000f296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF296 5692 bytes
SHA-256: eb1fe251fd18add38b6f9656b02eb9b16a606022e5d44ee7e810fd0796cca7ca
font_01_sfnt_off000105e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E6 10576 bytes
SHA-256: c53cce674df1d601002f3e1617ca5d829fe7d9332a8af5f3ee0833166b58a3ea