Malicious PDF — malware analysis report

Static analysis result for SHA-256 817a8aa37812ae06…

MALICIOUS

PDF

76.7 KB Created: 2021-03-09 10:00:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 57c4070abd963491b0fd676379cb5141 SHA-1: 21489db322bc74fb45d44ac045c916d1afa9bc19 SHA-256: 817a8aa37812ae0652e032078e5aaebfe79fb4ea71b92a8c3599e7277e9d48b0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 5

  • 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 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://nipisod.ru/wix?keyword=ffx+double+and+triple+overdrive PDF link annotation
    • http://bikomowaxibujoj.medianewsonline.com/fosegodaritefevufuzil.pdfIn PDF document text
    • http://game-pro.xyz/briggs_and_stratton_625ex_enginevbw0x.pdfIn PDF document text
    • http://it50disconto.info/pogobonipiruvvko.pdfIn PDF document text
    • http://xitabijasava.getenjoyment.net/94654405332.pdfIn PDF document text
    • https://cdn.sqhk.co/sadopore/eBqCjhy/mystery_hidden_story.pdfIn PDF document text
    • https://cdn.sqhk.co/pabukerofo/2fr8Cjd/aoe2_build_order_fast_castle.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dab7fb03-f2af-4a8e-9cb9-31de623bedb3.filesusr.com/ugd/58b596_464f77caba964e928bd974d3290d22a8.pdf?index=trueIn PDF document text
    • https://684917c6-b594-4497-9ea4-141105166a5b.filesusr.com/ugd/0dc9f5_ab2525c027c94780aef7ec4270618bdf.pdf?index=trueIn PDF document text
    • http://vobewegogiz.rf.gd/xejidir.pdfIn PDF document text
    • http://zatuvejamubolo.atwebpages.com/kojewijemaleluzeduwe.pdfIn PDF document text
    • https://7a579b3f-ce96-4c66-abdc-991530493d29.filesusr.com/ugd/010c6b_b098bc6214614fa8bd3a733f1ada96ed.pdf?index=trueIn PDF document text
    • http://redojirax.epizy.com/sanorovewipezawelu.pdfIn PDF document text
    • https://5b0e1d79-1acc-45ba-a965-31015372eee8.filesusr.com/ugd/67f5f7_a59d581984dc458a9649a538333ced16.pdf?index=trueIn PDF document text
    • https://b1b1ed1d-a631-407f-b8a0-2f609481a9c2.filesusr.com/ugd/3e5895_6de11530141b4be4a4f60a29beaebe1c.pdf?index=trueIn PDF document text
    • https://441768bb-9839-4df4-8f78-dd1233b527f6.filesusr.com/ugd/7e6080_d7dc2ed0f90447b798c40f876820e5a5.pdf?index=trueIn PDF document text
    • http://rowigos.rf.gd/37776226684.pdfIn PDF document text
    • https://fa886832-b9e3-4ce5-a98c-97da2614721f.filesusr.com/ugd/9f8050_8e9b260d1b504dc68ca076fc95f7899e.pdf?index=trueIn PDF document text
    • http://zutugidod.onlinewebshop.net/lusakife.pdfIn PDF document text
    • https://c827806f-f9bf-4fd3-a4ce-e487c020fa79.filesusr.com/ugd/6fd45c_70ff62d3ee5641dd9d179d3bf70aa8f9.pdf?index=trueIn PDF document text
    • https://2c549fd3-bbcc-4e43-aea5-84609313cfd4.filesusr.com/ugd/c162b3_3cd8a9f1ba5e4d00af213cfb6a43f52d.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF98 4448 bytes
SHA-256: 7730143b2ac99a026216de4300fbb1866b2d3f5b76c7b5f09c90574eb8c334b9
font_01_sfnt_off0000ef52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF52 5080 bytes
SHA-256: 9bd1bcf1fbab5a9f3092b88fde3d645f076d17c2276b208cd14db7c7c19a74cb
font_02_sfnt_off000100b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B5 10604 bytes
SHA-256: eb2bdd61568954ca90a59342bd7af718434d91a92a519d4d7cf92db1fa08602f

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