Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0f77e6267e729cd…

MALICIOUS

PDF

76.6 KB Created: 2021-02-12 01:40:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 77918db4474bbe2ee90a7cd1202e999a SHA-1: 36368b14fdbde53395191ebcf58fa0ed7d8718bf SHA-256: a0f77e6267e729cd147afb02469c0853d67b052bf63568403f81002e9cd948a1
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/123?utm_term=think+for+yourself+question+authority+tool PDF link annotation
    • https://cdn.sqhk.co/fatobaliv/cjcRGN9/religious_christmas_bingo_printable.pdfIn PDF document text
    • https://tazuwadafif.weebly.com/uploads/1/3/4/8/134857375/lilit.pdfIn PDF document text
    • http://tiwirodizefa.iblogger.org/sajitusefogape.pdfIn PDF document text
    • https://cdn.sqhk.co/kunimanujage/VhhW0he/hello_neighbor_alpha_2_xbox_one.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480886/normal_600b9d03e00db.pdfIn PDF document text
    • https://cdn.sqhk.co/zerurukoraju/FQ8hghb/red_balloon_movie_90s.pdfIn PDF document text
    • https://nelejejo.weebly.com/uploads/1/3/4/8/134883178/3645874.pdfIn PDF document text
    • https://cdn.sqhk.co/vilonunufuk/9jbvial/sago_mini_trains.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466140/normal_601711baa896a.pdfIn PDF document text
    • http://fogazino.iblogger.org/2015_buick_regal_gs_owners_manual.pdfIn PDF document text
    • https://tasiwusod.weebly.com/uploads/1/3/5/3/135351817/83ed888a36.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482860/normal_5fcbeccd6353e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/muwuxirido.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/dial_antibacterial_hand_soap_msds_sheet.pdfIn PDF document text
    • http://favavobebin.epizy.com/fenovitulexowowepeg.pdfIn PDF document text
    • https://s3.amazonaws.com/sixolose/everfi_module_9_investing_quiz_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wapabefizosumi/ubuntu_iso_for_vmware.pdfIn PDF document text
    • http://pogifovemujure.epizy.com/8_ball_games.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_off0000eeba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBA 5096 bytes
SHA-256: 3651bda02cd60407b6046cb83335e3f7b69187ebb52fb9640f73a1fabb5b776e
font_01_sfnt_off00010016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10016 10948 bytes
SHA-256: a6ae0b54a950f738fd8a675458e00ff344463e8a68785e598eb288b935ebdb1d

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