Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc234f6bccc3f49a…

MALICIOUS

PDF

81.5 KB Created: 2021-06-02 21:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 3f8fcdb82f2cce3b7665a3e4661f8000 SHA-1: 771a827e9bdc1b77da34d52fc87ad70c06df432a SHA-256: cc234f6bccc3f49a0f18b5c49f243f1447b1f180fa705d812ba391c6427ea359
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, and contains a large number of external links, many hosted on disposable domains. The document body, though heavily obfuscated, appears to be a lure related to 'games for 9 year olds', directing users to a link farm. The presence of PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a deliberate attempt to create a network of redirecting links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://garglob.ru/pbw?utm_term=best+switch+games+for+9+year+olds PDF link annotation
    • https://ludubilataso.weebly.com/uploads/1/3/4/7/134719947/4793967.pdfIn PDF document text
    • https://kilutiwoxit.weebly.com/uploads/1/3/1/6/131636983/ae03f8ce028.pdfIn PDF document text
    • https://ledugatikafaf.weebly.com/uploads/1/3/4/6/134693541/tolavatob.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4393898/normal_60b041723e4f3.pdfIn PDF document text
    • https://nevutero.weebly.com/uploads/1/3/4/7/134716167/gemesomunu.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4418788/normal_60b2f5819ec6e.pdfIn PDF document text
    • https://zuvurakos.weebly.com/uploads/1/3/4/0/134042350/sepepufulimutij.pdfIn PDF document text
    • https://fidedelab.weebly.com/uploads/1/3/4/0/134096197/mesigewedapotepokek.pdfIn PDF document text
    • https://pikimekexer.weebly.com/uploads/1/3/4/5/134587048/9773674.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464070/normal_6040c2dcbddbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384825/normal_601e0a18ae347.pdfIn PDF document text
    • https://viduxetejogat.weebly.com/uploads/1/3/4/6/134600114/zojiveke_pujalebajopaj.pdfIn PDF document text
    • https://pekamolotoli.weebly.com/uploads/1/3/4/6/134696990/8530100.pdfIn PDF document text
    • https://boxenujevodaziw.weebly.com/uploads/1/3/1/0/131070305/1455167.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382965/normal_6004b8525efd8.pdfIn PDF document text
    • https://xodimiteti.weebly.com/uploads/1/3/0/7/130776847/rufigekilul-vosalevesap-vedipamiruvok.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pefagisunel.pbworks.com/f/bunusofubeleroxi.pdfIn PDF document text
    • http://togiwuvoze.pbworks.com/w/file/fetch/144481296/how_do_you_use_ordinary_products_for_acne_prone_skin.pdfIn PDF document text
    • http://fokopaviwu.pbworks.com/f/25429811965.pdfIn PDF document text
    • http://lifelekufa.pbworks.com/w/file/fetch/144515199/94810944264.pdfIn PDF document text
    • http://wixugigir.pbworks.com/w/file/fetch/144458871/a_grain_of_wheat_book.pdfIn PDF document text
    • http://zexowisam.pbworks.com/f/free_printable_horse_race_game_board_template.pdfIn PDF document text
    • http://mefijunov.pbworks.com/w/file/fetch/144417780/dominos_number_of_locations.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_off0000fc56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC56 5832 bytes
SHA-256: 409ccd0a2a9a4f19e316a08da994b0252bd8e7f483f85c100ee6e859db465cda
font_01_sfnt_off0001101a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101A 11412 bytes
SHA-256: 58afd6ec8b5aff8f161475d605e8bdfb1cb59e6d7c68653c1d8c93aca19416d1