Malicious PDF — malware analysis report

Static analysis result for SHA-256 a728c101829434dd…

MALICIOUS

PDF

70.8 KB Created: 2020-12-30 11:21:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: bec0a91842ef9c8eaf5b9521da8fc4d8 SHA-1: 3e9c060d00317a7ad15b08ea714bb1c3b7469fb0 SHA-256: a728c101829434dd339f40c9b18cdf4f54cc85b4611b7b1d8a66deec5997cea7
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, identified as a link farm for SEO purposes. One of the primary external URIs, 'https://trafffi.ru/strik?utm_term=angie%2527+s+list+mn', is likely a malicious redirector. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan.

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 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/strik?utm_term=angie%2527+s+list+mn PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4499653/normal_5fd9c976700b1.pdfIn PDF document text
    • https://cdn.sqhk.co/matelasoguje/jhbpafZ/hd_video_player_pro_apk_cracked_free_download.pdfIn PDF document text
    • https://jobubati.weebly.com/uploads/1/3/1/4/131453688/2828415.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377909/normal_5fa05e82f3a15.pdfIn PDF document text
    • https://cdn.sqhk.co/sisalubitot/fMgdajb/civil_war_battles_virginia_beach.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387031/normal_5fb4e5b458b9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367627/normal_5f874bd6345f2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380876/normal_5fdd15628960a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372100/normal_5f971d5584896.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384050/normal_5fa18de102afd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472488/normal_5fb3013c57434.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386347/normal_5fc89ab526723.pdfIn PDF document text
    • https://cdn.sqhk.co/majumoros/ggjGQgS/airplane_mode_movie_2019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447467/normal_5fa153998cd7b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000da5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5F 4720 bytes
SHA-256: bafecffd902486b54b10a9184fb7d250ba5c2e1561d6b82e7ef082eed3d318ca
font_01_sfnt_off0000ea6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6E 10660 bytes
SHA-256: d6fe2706b7086ce5e754377cd0ab2d15c99767a8cfd9f8b1ca4bd792bc4d2794

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