Malicious PDF — malware analysis report

Static analysis result for SHA-256 c882871baf3926a4…

MALICIOUS

PDF

77.1 KB Created: 2021-02-20 11:30:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 0195f120673247e578a286fca464183d SHA-1: db4eb4c0161f21d9938e4b3f57ef0d9ed38f933d SHA-256: c882871baf3926a48bb7bafa4f6c5da6fd0ad14195845d8d720c58964da1ba21
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as a phishing trojan by ClamAV and an ML classifier. It contains numerous external URLs, many of which point to disposable hosting and are likely part of a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this behavior. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript for malicious purposes, hence the T1059.007 technique.

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://bologen.ru/123?utm_term=voynich+manuscript+decoded+2020 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4404500/normal_60088a8947f43.pdfIn PDF document text
    • https://cdn.sqhk.co/masunidupag/gI1hiaa/torapesilamukowozelunital.pdfIn PDF document text
    • http://7lessons.space/logotype_book8594f.pdfIn PDF document text
    • http://net-klientov.ru/adjectif_pithte_et_attribut_exercices_corrigsh33rp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407781/normal_601d8454320c1.pdfIn PDF document text
    • http://2gusevshop.space/4020902143qp7p4.pdfIn PDF document text
    • http://pubgmobiie.com/sunrace_12_speed_xd_cassette_reviewb8192.pdfIn PDF document text
    • https://cdn.sqhk.co/sebuwemid/gGgddjh/arcade_machine_repairs_perth.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367632/normal_60178f91608d2.pdfIn PDF document text
    • http://triple-doska5.club/bepakevudijavetiae0yi.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/luxaduzimase/nice_guidelines_post_traumatic_stress_disorder.pdfIn PDF document text
    • https://s3.amazonaws.com/seriposuj/android_ios_cross_platform_game_development.pdfIn PDF document text
    • https://s3.amazonaws.com/bifadiwuwileji/bukuv.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

Related samples 2

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10E 5504 bytes
SHA-256: d45e97b013c2da033443c22786be3d83f70bcc8b9d737276a4cedbf97bc950ab
font_01_sfnt_off0000f390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF390 11396 bytes
SHA-256: 96974b99abe1c94e1b6330de1edc384d6a191b91c9dc0cc015edd4803e52d3ca
font_02_sfnt_off00011984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11984 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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