Malicious PDF — malware analysis report

Static analysis result for SHA-256 637d10ce3cd317ed…

MALICIOUS

PDF

67.4 KB Created: 2021-03-24 09:40:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 050584e1115ddfdb4c8569ef5861dc7c SHA-1: 4c6198bcb277634cd31711080da2effa5301581d SHA-256: 637d10ce3cd317ed9037d563073ddbe73d838911a572af3dfc1de6430cf901d4
126 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and numerous external links are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://static.s123-cdn-static.com/uploads/4419650/normal_5fc8159bd25ba.pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4426945/normal_60259b94701c2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443804/normal_5ffcb8fb93c25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387826/normal_60416093e5d8e.pdfIn PDF document text
    • http://gazawes.22web.org/82662679498.pdfIn PDF document text
    • https://cdn.sqhk.co/pagozixupezi/CheJibs/among_us_telegram_sticker_pack.pdfIn PDF document text
    • http://wejixekolubuguw.iblogger.org/nekevibe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501509/normal_60582bb1661cb.pdfIn PDF document text
    • https://cdn.sqhk.co/mogezunir/ighaibD/wolf_cross_stitch_pattern_etsy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/wb/ENAH/~3/Xr6F2PkPTcg/wb?keyword=delta%20table%20saw%20motor%2062-044PDF link annotation
    • https://5c71d6b4-13b5-43a2-97a4-9a0eba4d0f4d.filesusr.com/ugd/0f1814_0377347e24a54383b0c3831e67d17473.pdf?index=trueIn PDF document text
    • https://32e47638-7206-44c1-ad53-5c6f9176402e.filesusr.com/ugd/e00742_ca1570dc4c9e4d30bd016e4d2d3243f6.pdf?index=trueIn PDF document text
    • https://36fc1fe3-b646-4cc1-b6e9-de51469aea27.filesusr.com/ugd/3eb4bd_54995293e769458d90a02a32a15b5386.pdf?index=trueIn PDF document text
    • http://puwepubofixa.epizy.com/asma_sinais_e_sintomas.pdfIn PDF document text
    • https://203e7bc3-08d7-4ecc-a8df-f797e0d4a079.filesusr.com/ugd/d4579c_ff32bc7fc0c54e7ca63c911ce2da2960.pdf?index=trueIn PDF document text
    • https://8f6f9f04-f977-4239-955d-f6aecf2dd879.filesusr.com/ugd/81cd61_8a8c0ef3733a410fbcae831eb23936d5.pdf?index=trueIn PDF document text
    • https://dec4a425-646e-450a-80ca-a73a75d058ad.filesusr.com/ugd/ba3095_901d57abda694d649905be5c3f91e5cb.pdf?index=trueIn PDF document text
    • http://duximepameme.epizy.com/xorelikovudeluzenixasorux.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_off0000c744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC744 5612 bytes
SHA-256: ea4177330f025c5aad7b3ee96bfaafcde2c0dd2578e8fd945e86ad698e654ed9
font_01_sfnt_off0000da6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6A 10696 bytes
SHA-256: 5b6e49200ee4723c48dcad37ca10c8f46bc2fa6fb7f469ffd2ccd4a2e16154d2

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