Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fda1dae5cfc84ee…

MALICIOUS

PDF

79.2 KB Created: 2021-03-19 05:22:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: cc60dcbd01b460e5380e9b91d07c1f69 SHA-1: a91a293e9f51b9aebe1d87552d7ff283bc1bc7aa SHA-256: 6fda1dae5cfc84ee275e0856002e4d5b4348b4e80f8d9d459abb7cd256a65178
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains or link farms, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a spearphishing attachment, likely designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://soxebez.ru/123?utm_term=argonauts+maggie+nelson+pdf PDF link annotation
    • https://cdn.sqhk.co/nerenina/1ib5l0R/33645322614.pdfIn PDF document text
    • http://legionmone.xyz/adverbs_of_place_and_time_worksheetrad86.pdfIn PDF document text
    • http://useraisins.pro/are_carquest_brake_pads_goodcdqmj.pdfIn PDF document text
    • https://tizukusijevawus.weebly.com/uploads/1/3/4/4/134454617/4479668.pdfIn PDF document text
    • https://cdn.sqhk.co/mezutorixo/geia0Lj/86694566702.pdfIn PDF document text
    • http://pozijuza.scienceontheweb.net/87963077331.pdfIn PDF document text
    • https://xipakopubax.weebly.com/uploads/1/3/5/9/135966228/776a6db368065.pdfIn PDF document text
    • http://shtangye.xyz/bipolar_spectrum_diagnostic_scale6wt8t.pdfIn PDF document text
    • https://cdn.sqhk.co/mowezeto/ugpKghg/dj_bottle_telugu.pdfIn PDF document text
    • http://forpost-electrica.ru/1907241090440sbx.pdfIn PDF document text
    • https://cdn.sqhk.co/wesifarajaru/iV4lgeU/do_lynx_spider_bite.pdfIn PDF document text
    • http://xafesuvorolivig.scienceontheweb.net/kopatuw.pdfIn PDF document text
    • http://yatvoyya.fun/5116270154361hx7.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/vuforewebub/best_1080p_movies_site.pdfIn PDF document text
    • https://s3.amazonaws.com/jimugivos/horizontes_script_font.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/59835434000.pdfIn PDF document text
    • http://fuvuvadut.onlinewebshop.net/55396029910.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_off0000f8ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EA 5348 bytes
SHA-256: a7148802b00c7129413ff045e285695b52f09bd394af4e52ccad2eaa7926f686
font_01_sfnt_off00010b04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B04 10792 bytes
SHA-256: 565f23ecf9a73bc4c4cf83d34f061aaeea05f54cb6aa419d6eb526ba34606eaf

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