Malicious PDF — malware analysis report

Static analysis result for SHA-256 78d60312a7d5a8d4…

MALICIOUS

PDF

70.3 KB Created: 2021-02-20 23:56:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 51aa9429995e4eb65d8180d9df747543 SHA-1: 7e65a8841e87c758129ed57f79327d716ac697ad SHA-256: 78d60312a7d5a8d455389c2fc219635a89985811e422f2c0a8a07bcbd74a6329
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm designed to redirect users to other malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and external link farm behavior are indicative of a malicious document, potentially leveraging embedded JavaScript for further actions.

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://leonvi.ru/strik?utm_term=how+to+fry+turkey+breast+in+butterball+fryer PDF link annotation
    • https://cdn.sqhk.co/gawagunikuw/3idgfeG/87899062031.pdfIn PDF document text
    • https://cdn.sqhk.co/xokekekav/cic7hgj/gixewekukuvubumukupiliwuv.pdfIn PDF document text
    • http://kukikifo.iblogger.org/introduction_to_computer_interview_questions_and_answers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459941/normal_6002d8525c3e7.pdfIn PDF document text
    • https://fumewalifo.weebly.com/uploads/1/3/4/8/134884483/zorimobiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380084/normal_6014247ae9e3d.pdfIn PDF document text
    • https://cdn.sqhk.co/xafukapewe/bhVvtrw/nations_in_combat_hack.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379602/normal_603130a5f0e48.pdfIn PDF document text
    • https://cdn.sqhk.co/wadusazilox/jjcrhda/vumuga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388289/normal_5fe9cc81bbf69.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454558/normal_5ff4b5837bb01.pdfIn PDF document text
    • http://nelezoroga.22web.org/legend_of_zelda_theme_piano_sheet.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/gotenukevepunin/amazon_kindle_play_store.pdfIn PDF document text
    • http://tupemovon.rf.gd/xazasudoj.pdfIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/banner_design_photoshop_templates.pdfIn PDF document text
    • http://fuwuwiri.rf.gd/mumutenojim.pdfIn PDF document text
    • https://s3.amazonaws.com/gogonof/anguttara_nikaya_pali.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_off0000d622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD622 5120 bytes
SHA-256: cd9c18803d7b31d949122ae648b3fa655b100324b5886d74b0c5e9baaaeaab3a
font_01_sfnt_off0000e7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B7 10640 bytes
SHA-256: fa9e0214fc005f3b38383e80a59eaedcabcf018e807178382be7c9aee889e666

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