Malicious PDF — malware analysis report

Static analysis result for SHA-256 87c116237e0bbb91…

MALICIOUS

PDF

70.6 KB Created: 2021-06-12 07:20:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: a60a4710fb3e9042bd1ad9654dc3bcf5 SHA-1: 328d12e517d05b68328ffeaca25826a34109eb87 SHA-256: 87c116237e0bbb91402bf196ef69acb7f3820588f9af011e065a7a64be62ec44
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to link farms or disposable hosting, suggesting an attempt to obscure the true destination or distribute a payload. The document body, though heavily obfuscated, references 'Insta pro mod apk unlimited coins', aligning with the phishing lure observed in the URLs.

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://huntic.ru/pbw?utm_term=insta+pro+mod+apk+unlimited+coins PDF link annotation
    • https://weziriditovi.weebly.com/uploads/1/3/4/1/134108838/8998345.pdfIn PDF document text
    • https://jawejeletisib.weebly.com/uploads/1/3/4/8/134886371/6864581.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374022/normal_6046afb54c342.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393485/normal_5ff51b8cc7bcf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393772/normal_5fe64f50e55a5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368228/normal_6004741186c77.pdfIn PDF document text
    • https://ribebolavat.weebly.com/uploads/1/3/1/3/131398139/gutife.pdfIn PDF document text
    • https://dapobatajixafaw.weebly.com/uploads/1/3/4/3/134310280/raxajobakilu_bobiro_mupanenijila.pdfIn PDF document text
    • https://potezevaledu.weebly.com/uploads/1/3/1/4/131406960/mowejozirilekiw_nebowonopatiko.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386074/normal_5ff92f44eb9cc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c046f431-1fef-4a42-991e-bb618b428e6c/27978084906.pdfIn PDF document text
    • http://nuwiwaweber.pbworks.com/f/forward_reverse_starter.pdfIn PDF document text
    • http://ridezerarumu.pbworks.com/w/file/fetch/145114596/holloway_vs_mcgregor_full_fight.pdfIn PDF document text
    • http://zuvuwiro.pbworks.com/w/file/fetch/145165869/the_chaperone_destiny_2_pvp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22c28536-dfb4-49e9-9c62-19db3960467c/77238228515.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/124a4c6b-d390-4d13-a89d-d53734d4cd9f/buy_tinder_gold_promo_code.pdfIn PDF document text
    • http://lifelekufa.pbworks.com/w/file/fetch/144790662/40680537092.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61bd07a4-d430-41d7-b6c6-073f80b4a12b/71462037053.pdfIn PDF document text
    • http://xuvabufoj.pbworks.com/f/mcq_anesthesia_free_download.pdfIn PDF document text
    • http://dajodovilav.pbworks.com/f/multiple_choice_questions_on_atomic_physics.pdfIn PDF document text
    • http://gegoxelaw.pbworks.com/f/korodugedabe.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_off0000d608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD608 5220 bytes
SHA-256: 0f355ff8f5758ed26ac6ad3e32a77b0f54d27bed51d993f2fd0efe52be586b99
font_01_sfnt_off0000e7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B4 11056 bytes
SHA-256: bc4c61c273c40a7b1a8589f7cca62cf3ecb15ddc4e405fe8e3bce69092da6250

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