Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4e6e254e0be83d9…

MALICIOUS

PDF

70.8 KB Created: 2021-06-06 21:36:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: c09ed7dd714a80925655706260abba0b SHA-1: e24f999eb09a57398b744d93f0110065400e4184 SHA-256: b4e6e254e0be83d922c619e2f6c7bcc701cafe91f25cd8d97146302b3565df1c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, and one specific URL is associated with 'pnc bank wire transfer time'. This suggests a phishing or link-farming attack pattern. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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://laborke.ru/pbw?utm_term=pnc+bank+wire+transfer+time PDF link annotation
    • https://likuxosudiva.weebly.com/uploads/1/3/4/6/134603152/punogomanew.pdfIn PDF document text
    • https://xavidupi.weebly.com/uploads/1/3/4/7/134723560/lawezeb.pdfIn PDF document text
    • https://nobarikanu.weebly.com/uploads/1/3/1/4/131483152/5002216.pdfIn PDF document text
    • https://guxemufisi.weebly.com/uploads/1/3/2/7/132710659/vixutesurorefu.pdfIn PDF document text
    • https://kotevopokevunab.weebly.com/uploads/1/3/4/5/134590751/76331167b6022.pdfIn PDF document text
    • https://pikivazok.weebly.com/uploads/1/3/0/8/130873779/tukikawoga.pdfIn PDF document text
    • https://xokefazekuli.weebly.com/uploads/1/3/5/9/135992394/jiziforotuw-pigisijupuvuv-zezani.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zixereves.pbworks.com/f/3795900021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf1dd988-5276-4da4-ae5d-031bfb4ae5d5/47096777898.pdfIn PDF document text
    • http://sofutikajen.pbworks.com/w/file/fetch/144658104/poduxaduduzir.pdfIn PDF document text
    • http://niwomif.pbworks.com/w/file/fetch/144427467/why_is_ophelia_upset_in_act_2_scene_1.pdfIn PDF document text
    • http://foxobekizax.pbworks.com/w/file/fetch/144468687/chinese_khmer_dictionary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e917934-e6cb-44e8-bb4d-3d51cf759a8a/lemefisobelexanopelejojoz.pdfIn PDF document text
    • http://mamejoniza.pbworks.com/f/direct_method_and_grammar_translation_method.pdfIn PDF document text
    • http://gazumadu.pbworks.com/w/file/fetch/144444318/wofefofuzurerosesab.pdfIn PDF document text
    • http://japomajuxire.pbworks.com/w/file/fetch/144442653/pogisutidana.pdfIn PDF document text
    • http://xafusigivu.pbworks.com/f/sampieri_metodologia_dela_investigacion_5ta_edicion_gratis.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_off0000db8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8E 5292 bytes
SHA-256: bfa3fb551569c54e5790c63e1c94d53aee4715e51812b2ea2ad45609c250eef3
font_01_sfnt_off0000ed8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8F 9640 bytes
SHA-256: 269c21bfb42c177c7dd291a1d9ce785e6bca6bec7ee3cd5908c799129cf8a020

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