Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5a652ed68161567…

MALICIOUS

PDF

79.6 KB Created: 2021-03-25 04:59:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 5ec3b1eea683be77ce3c4fa88d21727c SHA-1: a5e480c4a9fa5f3f5173935cfd30438d0cc65261 SHA-256: a5a652ed681615674010ea06894beb059f970848e1eb3015515011410adfc9ef
206 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external links, some of which are on disposable hosting. The document body, though partially corrupted, suggests a lure related to search results or informational content, aligning with phishing or scam tactics. The presence of multiple external links suggests an attempt to redirect the user to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • 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://kuzutuzo.ru/wix?keyword=what+is+classed+as+a+retail+environment PDF link annotation
    • https://cdn.sqhk.co/parikozug/f1uogfN/best_snes_emulator_android_tv.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/CtgeAkE/xujugu.pdfIn PDF document text
    • http://kifejuja.medianewsonline.com/52097411351.pdfIn PDF document text
    • http://sesizuxewewax.mygamesonline.org/birthday_girl_penelope_douglas_free.pdfIn PDF document text
    • http://fikosarodone.medianewsonline.com/let_the_right_one_in_full_movie_online_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a0f88182-e1f9-4a9c-ba22-d5ce004c6985.filesusr.com/ugd/2f3216_51f9b5bcc4944319ad2bd64ffaa8cc59.pdf?index=trueIn PDF document text
    • https://f72b89be-0fa6-41ee-8162-331329ef78ce.filesusr.com/ugd/95089d_ba65a23ee635485aa698c929e0b3b63c.pdf?index=trueIn PDF document text
    • http://segurixuzek.myartsonline.com/dunugukurijoxisenex.pdfIn PDF document text
    • https://f803bf1b-e1c2-47f6-a41f-c9785c88fbd4.filesusr.com/ugd/bf07b1_b75cf6ad34124ddb94ae9c1c7324924c.pdf?index=trueIn PDF document text
    • https://3e1af3dc-cf37-4f58-935d-0a6065bc5ce9.filesusr.com/ugd/3ca236_d80ba21fd52944ceba7676f04eaa53ef.pdf?index=trueIn PDF document text
    • https://198ac300-f2de-41a8-aaa9-2df0d2bfefbb.filesusr.com/ugd/232b71_058afbb0966540e691f1cbf0cbdf504e.pdf?index=trueIn PDF document text
    • https://8b8c7005-3af0-45a1-8e5b-a6902caa9335.filesusr.com/ugd/dbd7d9_fcdce88c10de411dbb29dfda1ffe586d.pdf?index=trueIn PDF document text
    • https://3bcdeb60-9876-4d14-bc0a-1dd1632c647c.filesusr.com/ugd/16a96a_b057e46fa04c43039bdd8ad736bfed25.pdf?index=trueIn PDF document text
    • https://be1d055c-b83b-422e-9e68-1bf13cef350c.filesusr.com/ugd/5b1e3c_370de861dd3742fd8df56d6b803e8eec.pdf?index=trueIn PDF document text
    • https://c03439ef-6557-4199-865e-586791a52b6c.filesusr.com/ugd/6bb4a2_b5387a49db1445c6889f4eb4e068300b.pdf?index=trueIn PDF document text
    • https://e301b21f-f707-426c-a094-6199d4b1a2d6.filesusr.com/ugd/f65518_8b4af5b6064a4141b5f3c663837e7b82.pdf?index=trueIn PDF document text
    • https://584dc5e1-4449-4bca-b3d9-d0e1fa08a972.filesusr.com/ugd/185caa_4e99349f29d44e6bad5956b1467596c4.pdf?index=trueIn PDF document text
    • https://30383b9b-b26a-44f4-9a26-03873af8f03c.filesusr.com/ugd/fdee49_a96ed07e6f6543878714a7aef645a1c0.pdf?index=trueIn PDF document text
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_f6b40dedefe44281aad55d59e55a91a9.pdf?index=trueIn PDF document text
    • https://59cf682b-6680-4a08-8b8d-0472bab64ef7.filesusr.com/ugd/d7d6cd_6727902b8dca4ed6a06c7d671c4db45e.pdf?index=trueIn PDF document text
    • https://4407eba0-147d-4e9d-98ff-19010b67f466.filesusr.com/ugd/c1f2fd_e7c50bd969d84650a049d6577048e8ca.pdf?index=trueIn PDF document text
    • https://a2ae8793-a99f-480d-a3bc-849ef63d34f7.filesusr.com/ugd/cc207a_1a0ba3b2d9604486849590d33f583a84.pdf?index=trueIn PDF document text
    • http://sorisavitekinuj.onlinewebshop.net/mcp61pm-hm_nettle3_bios_update.pdfIn PDF document text
    • https://b24182fa-1fee-416c-9f57-41d8a36573e1.filesusr.com/ugd/1cc367_ef20247d226f4c90960f012cc4586dcc.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_off0000f7fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FE 5252 bytes
SHA-256: 98e0708c204a9222ac5764d40bfb1a28b7267eaa330e4ab7a8f6254fe1e1a4a2
font_01_sfnt_off000109bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BD 11600 bytes
SHA-256: 50585d7d2e2cec3a90816f44cc4f67334d21eb8f3430151338d9d4d983d34ad8

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