Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebf660be11ee52e1…

MALICIOUS

PDF

76.8 KB Created: 2021-03-03 15:10:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: ce4ac603319b06951263ebeb22ce8c42 SHA-1: c876a91aa7871da61820646b23504561c928421d SHA-256: ebf660be11ee52e17e952c8771728cfb4623ffc7ea87ade4f5eec46375860ced
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains and link farms, indicating a malicious intent to redirect users. Heuristics like PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM strongly suggest this is not legitimate content. The ML classifier and ClamAV detection further confirm its malicious nature, likely as a phishing or SEO spam distribution mechanism.

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://resalured.ru/123?utm_term=millions+of+cats+pdf PDF link annotation
    • https://cdn.sqhk.co/pedidagow/ieHdNN3/dijovuxa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480399/normal_5ff7d3f9ef4d1.pdfIn PDF document text
    • https://cdn.sqhk.co/fowipovoji/n6Rtidl/jegujarugemalanoxefe.pdfIn PDF document text
    • https://cdn.sqhk.co/tosilura/hajc11B/72045950524.pdfIn PDF document text
    • http://vashmaster.info/can_you_add_apps_to_echo_show_8290yq.pdfIn PDF document text
    • http://figimumagoko.mygamesonline.org/25341911426.pdfIn PDF document text
    • http://mexicotop3.xyz/65369317176piqxk.pdfIn PDF document text
    • https://cdn.sqhk.co/nurijodefa/bS70ggE/xajawo.pdfIn PDF document text
    • https://rejurikin.weebly.com/uploads/1/3/1/0/131070637/todapefijuw.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxozowaki/jGAQgd2/98510022875.pdfIn PDF document text
    • http://xevusezes.medianewsonline.com/iso_27001_password_policy_template.pdfIn PDF document text
    • http://armada.technology/387773686058cstv.pdfIn PDF document text
    • https://cdn.sqhk.co/zegareguw/eANoX8K/subway_franchise_cost.pdfIn PDF document text
    • http://tewatag.medianewsonline.com/91001230622.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nejimafalun.onlinewebshop.net/is_moto_e5_a_good_phone.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_off0000ef95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF95 5056 bytes
SHA-256: 568340bcb3703204c68aaccdc214201294081fdcbb13ab2c0d459c0599cebcd1
font_01_sfnt_off000100f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F1 11176 bytes
SHA-256: 638b46bf26b1d9f6878f9d51d7c90cc72febf85182d6c733f4f20fee60a6c0dc

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