Malicious PDF — malware analysis report

Static analysis result for SHA-256 55c0538779a69815…

MALICIOUS

PDF

78.9 KB Created: 2021-02-06 06:04:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: bac768168c968f27df2d8d2732b26ddc SHA-1: 25a24b8463e6b59a82e9ff9dde0f47a8f808a6ef SHA-256: 55c0538779a6981582c664517905c8d0059f68ed71053b694e84f72391b88e39
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The primary purpose appears to be directing users to a network of potentially malicious or scam-related content hosted across various domains.

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://bologen.ru/123?utm_term=directions+to+laundromat PDF link annotation
    • https://cdn.sqhk.co/boremagu/hcV7Gr4/avengers_xbox_series_x.pdfIn PDF document text
    • https://cdn.sqhk.co/tuwagezo/Ejc94UJ/94890891214.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461505/normal_5fc7cb9b671b8.pdfIn PDF document text
    • https://cdn.sqhk.co/mutexeze/fWicJi5/pugubojapetewe.pdfIn PDF document text
    • https://ravaratu.weebly.com/uploads/1/3/5/4/135401011/5c8fd818.pdfIn PDF document text
    • https://fosegeluka.weebly.com/uploads/1/3/4/7/134717840/bugonudidoki_bosinowof_sipurisiwuj.pdfIn PDF document text
    • https://cdn.sqhk.co/lupekute/hcS3gig/fakabowubugasuja.pdfIn PDF document text
    • https://vedefagam.weebly.com/uploads/1/3/0/8/130814874/766441.pdfIn PDF document text
    • https://valofapapedor.weebly.com/uploads/1/3/1/1/131164243/piwizo-komesofi.pdfIn PDF document text
    • https://kogovuvukadag.weebly.com/uploads/1/3/2/6/132682039/lijowijapevavaf.pdfIn PDF document text
    • https://cdn.sqhk.co/gupuwiwi/piedggo/rusepozavobome.pdfIn PDF document text
    • https://cdn.sqhk.co/xaleteser/hIUhdgg/my_android_version_is_6._0_1.pdfIn PDF document text
    • https://cdn.sqhk.co/tokarikadez/4zejbmI/art_therapist_definition_psychology.pdfIn PDF document text
    • https://cdn.sqhk.co/kinibemazoz/ghujcNr/kiwus.pdfIn PDF document text
    • http://afracheat9.xyz/5083619380z0q32.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f71d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71D 5084 bytes
SHA-256: dca687438f87dd18c81c9909a5cfcba81654f966612d8d392360d44ac534983e
font_01_sfnt_off00010851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10851 11268 bytes
SHA-256: 6471f18a34c57cddd90cc32b82feed55e2aefa6597112a13cc529adb7e17f52d

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