Malicious PDF — malware analysis report

Static analysis result for SHA-256 790f000af26463b9…

MALICIOUS

PDF

80.9 KB Created: 2021-04-06 13:15:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e7e8d13795897c4e253b1e427eb128f7 SHA-1: 7f0053b4a017cef1983304a0315954ebdcd0cfb8 SHA-256: 790f000af26463b9b611aa4a57cdbf8bfa2bc3df57c5f4cc623b27f8cb2a353e
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains numerous external links, many of which point to SEO redirectors designed to obscure the final destination. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK' indicate a phishing or malware distribution scheme. The primary URL identified, 'https://seumenha.ru/strik?utm_term=ld+debate+flow+template+excel', is likely the entry point for this malicious activity.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://seumenha.ru/strik?utm_term=ld+debate+flow+template+excel PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4478947/normal_60018256477e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428329/normal_603631bcd8ca3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383792/normal_602f5e8f37649.pdfIn PDF document text
    • https://siwevamad.weebly.com/uploads/1/3/1/8/131871433/9400839.pdfIn PDF document text
    • https://cdn.sqhk.co/jakufomego/iaix4hj/gem_miner_dig_deeper_free_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/xevowuto/9VBaXgh/82849793158.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451929/normal_600ae28e20679.pdfIn PDF document text
    • https://cdn.sqhk.co/polopomoset/gbihrmz/13971148122.pdfIn PDF document text
    • https://loniforuwo.weebly.com/uploads/1/3/4/9/134904684/f698bd2cb8d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423155/normal_5fca94707d40d.pdfIn PDF document text
    • https://cdn.sqhk.co/gebitasixa/8yUo2hg/art_of_war_unified_galaxy_pirate_fleet.pdfIn PDF document text
    • https://cdn.sqhk.co/naboxolat/ihjjphh/gumewa.pdfIn PDF document text
    • https://cdn.sqhk.co/nivipanevi/6rR2Wjh/accountant_experience_certificate_format_letter.pdfIn PDF document text
    • https://cdn.sqhk.co/nugopanage/phdhfgj/ghetto_wallpapers_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/gobajejuz/Hgdeijo/78443059934.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450504/normal_600888d4c2b7c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://911f1565-2faa-4874-b261-330d521e7362.filesusr.com/ugd/f46427_0125abdbdee4473dbbd052033c68806a.pdf?index=trueIn PDF document text
    • https://3ea853e4-7f2b-4fb0-9229-b04907a1e321.filesusr.com/ugd/d94095_84295fef1794402882b36d0bbcc120c6.pdf?index=trueIn 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_off0000ff34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF34 5268 bytes
SHA-256: a83fb42662e06bbbf5c187119504d4ff6965d3d565eaad52abc35a0302b10697
font_01_sfnt_off0001112f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112F 10520 bytes
SHA-256: 2760e7d887e775b04fafc087a8ca1d104194121bcbd0c41f348fdec38341e2e4

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