Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee4d326e6439303d…

MALICIOUS

PDF

65.7 KB Created: 2020-12-06 17:22:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 3cb35d3ee180f3b1697b2c58bf3a33b8 SHA-1: 2d9feb410ddaf7495d43bfc13ee0d5cbc2f4e632 SHA-256: ee4d326e6439303df0df76e6e077e605c84a3f693b4106c8fcebbfa5f6102400
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, characteristic of a link farm or SEO spam. One of the primary URLs is trafffi.ru, which is suspicious. The document body is heavily obfuscated, but the presence of numerous external links suggests an attempt to redirect users to potentially malicious or unwanted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafffi.ru/strik?utm_term=soledad+high+school+counselors PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4427526/normal_5fa21ed16b45b.pdfIn PDF document text
    • https://mawakigimewu.weebly.com/uploads/1/3/4/8/134875352/xudavagikomuda-nefen-lidek.pdfIn PDF document text
    • https://zipazoraxegav.weebly.com/uploads/1/3/4/3/134325660/makutuzo.pdfIn PDF document text
    • https://fonilukixegob.weebly.com/uploads/1/3/4/8/134884535/godaza.pdfIn PDF document text
    • https://fidojosamesevuf.weebly.com/uploads/1/3/4/5/134594598/3908663.pdfIn PDF document text
    • https://dopuxaponaxu.weebly.com/uploads/1/3/2/6/132695391/rupotujaduzikij.pdfIn PDF document text
    • https://xawuvokepixa.weebly.com/uploads/1/3/4/6/134617960/kijedowimo_fupem.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/woxotopapozokev/square_root_calculator_in_simplest_radical_form.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/miss_rodeo_houston_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/jowutoneranemuk/actos_administrativos_concepto.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_off0000c539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC539 5304 bytes
SHA-256: bea28daad7ff9e7b55b938b56b3211eca8ba2ed8f90a98909db5f40a4ad69d21
font_01_sfnt_off0000d737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD737 10176 bytes
SHA-256: 53f079307c8a37a29748e668bedbdae346603e2f3ced6b96f46e2c3060968424

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