Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fe1cbf7c14ddeb4…

MALICIOUS

PDF

91.0 KB Created: 2021-01-09 05:28:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 79a17e49c6a6c4fb8b5b6779506b08f7 SHA-1: be7fe65024b05454e16118ac1d5bb680dfa955f2 SHA-256: 2fe1cbf7c14ddeb4824fbca1ea201437440fe160797eb0e584a84776a1526f5d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized, suggesting a link farm or spamming operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://trafffi.ru/123?utm_term=job+bible+character+traits PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387244/normal_5fd34c6a3a1bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408995/normal_5f968631166f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465537/normal_5fc7389d49319.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418000/normal_5fd9de389e4a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451565/normal_5fe991c1e5e06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483071/normal_5fe8d8824cd71.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374848/normal_5fe2df14bad48.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447253/normal_5fcb8dccb58f8.pdfIn PDF document text
    • https://rutujuxifir.weebly.com/uploads/1/3/4/6/134632780/604879.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411229/normal_5f937a433eefc.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/ritoma/vidmate_install_jio_phone.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/blank_nutrition_label_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/ballay_ballay_song_mp4_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/devil_may_cry_4_dante_style_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/lofese/wurth_hand_cleaner_safety_data_sheet.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_off00012971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12971 5016 bytes
SHA-256: f849553308a923f9a4de412877d9579aa6c86f4c6df06faf57802cf35bead592
font_01_sfnt_off00013a72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A72 10868 bytes
SHA-256: 715251488403c50baa96530f18685bcaaabbcf8f52768c6744993463fe36c994

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