Malicious PDF — malware analysis report

Static analysis result for SHA-256 e72111eb866c1812…

MALICIOUS

PDF

70.0 KB Created: 2021-01-30 13:49:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: e62228eb6646d14f350d1a3912014f5a SHA-1: e03da921f221b355f9b1c0e73b54619b14e06c4a SHA-256: e72111eb866c18122cafd2a0a59cafb39d2adc79acc8807ee571a03eb7df96b6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malicious content. ClamAV detection and ML classification strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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=canal+walk+richmond+restaurants PDF link annotation
    • https://cdn.sqhk.co/zobelekivix/jEhcjaP/classic_brick_breaker.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469634/normal_5fcf603db5f76.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383314/normal_5ff66a93ee612.pdfIn PDF document text
    • https://cdn.sqhk.co/bodevoposuji/ihgiiPT/zixinewo.pdfIn PDF document text
    • https://cdn.sqhk.co/tatiderubota/ijnjf6G/bmobile_sim_card_number.pdfIn PDF document text
    • https://cdn.sqhk.co/dizoketa/X2hcyNJ/zakuketoxisutinunix.pdfIn PDF document text
    • https://cdn.sqhk.co/werutojij/aJji2ja/61231079487.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503197/normal_5fe950ebea3cc.pdfIn PDF document text
    • http://duplicwcnj.space/word_crush_level_5513e1ig.pdfIn PDF document text
    • http://clientesdkb.com/friedel_crafts_acylation_on_phenolgeiy3.pdfIn PDF document text
    • https://cdn.sqhk.co/bavozazav/kic1ujh/dowerifi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489255/normal_5fe5b3d1a146a.pdfIn PDF document text
    • http://satofaxa.iblogger.org/74015036904.pdfIn PDF document text
    • https://cdn.sqhk.co/wibononuve/hhizUbJ/webafulamuzala.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bosulug.epizy.com/bexazuvikudekofumita.pdfIn PDF document text
    • http://kobinegugagikag.epizy.com/befijojixowijagozolaf.pdfIn PDF document text
    • http://gujusama.rf.gd/jaipur_double_bedsheet_online_shopping.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_off0000d2ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2EF 5240 bytes
SHA-256: 982334cf4fd0701b3d3b4d3721615353e74ce8abcd25db262824c006f26ad62b
font_01_sfnt_off0000e4a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A5 10736 bytes
SHA-256: 76d76ecd48cb5ecc60f3ce78c1ab9e0e7bdc230a58944661156a44deb7acb1ad

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