Malicious PDF — malware analysis report

Static analysis result for SHA-256 b37427df6625b22c…

MALICIOUS

PDF

98.6 KB Created: 2021-04-10 12:22:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 5f4c138737107897cb2cd62d5786496a SHA-1: 0a0c459318a45b429c63598e617a68d46ebf808a SHA-256: b37427df6625b22cfa56401e9246ea048d57eb2692f9989f114b725c638f39ab
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically pointing to a suspicious domain ('maypoin.ru') that is likely part of a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is designed to host many links, further supporting the lure-based attack pattern.

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://maypoin.ru/strik?utm_term=what+is+a+metaphor+simple+definition PDF link annotation
    • https://cdn.sqhk.co/tekemozuj/opjillK/boradatomovimabozez.pdfIn PDF document text
    • http://portkamesto.site/10062101169jjre3.pdfIn PDF document text
    • http://faceit.su/76070922834p9ns1.pdfIn PDF document text
    • https://cdn.sqhk.co/pimidima/fjcASha/47395939659.pdfIn PDF document text
    • https://cdn.sqhk.co/mugegiduveb/UzAjieC/14863420067.pdfIn PDF document text
    • https://cdn.sqhk.co/depivuni/cigibjY/table_top_arch_kit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486036/normal_5fd968775f9a1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489607/normal_5fc7709da80aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470981/normal_606c853980480.pdfIn PDF document text
    • https://cdn.sqhk.co/zezetemirag/idtcnCC/good_multiplayer_pc_games_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391921/normal_602ec26da04af.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392462/normal_5fff98f4afd74.pdfIn PDF document text
    • http://cherrypimp.online/gusosupezu1in18.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/reading_comprehension_test_book.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxirefare/manual_turtle_beach_px4_portugues.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0560765c-dba6-4675-bae2-ab76d6df45f6/bissell_cordless_vacuum_troubleshooting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59b4b71b-2a57-435c-9e91-0c33cbc4bc5a/garmin_vivofit_3_bands_jb_hi_fi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1fba1e1-0260-4ca2-bfa8-33cfcee2190b/pokoxatuferamividoli.pdfIn PDF document text
    • https://s3.amazonaws.com/pusixa/92822817809.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000132b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B6 5080 bytes
SHA-256: becf7a5c3a9dcb9ce005a62350480c5d0d1f4f22c463b45d7ceb8964e924284e
font_01_sfnt_off000143d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143D8 13584 bytes
SHA-256: 1882384fc00d629f2ef3df24f8ae3d2546c5378e9da57e78dfdbad78895d4353
font_02_sfnt_off00016edb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EDB 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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