Malicious PDF — malware analysis report

Static analysis result for SHA-256 4255790b1a71329e…

MALICIOUS

PDF

63.4 KB Created: 2020-11-11 07:53:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: a6cb8d72f8f9a3dbf16b9d92416dc646 SHA-1: 3a345e6fdb547ccb9f40537528ef11d7eb495b66 SHA-256: 4255790b1a71329e9ac9d4dbda681ab3945d502d07c9a35bb9e251b37439eadb
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting services and redirectors, indicating a link farm designed to distribute malicious content. The primary redirector URL is `https://traffine.ru/strik?keyword=pearson+geometry+textbook+answers`, which is flagged as malicious. The document body, though heavily corrupted, contains metadata suggesting it was generated by `wkhtmltopdf`, and the overall structure and link farm behavior are consistent with phishing or malware distribution campaigns.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffine.ru/strik?keyword=pearson+geometry+textbook+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4410447/normal_5f9975f9b2aff.pdfIn PDF document text
    • https://fenivubad.weebly.com/uploads/1/3/4/4/134482284/4970263.pdfIn PDF document text
    • https://nojupifidupo.weebly.com/uploads/1/3/4/3/134361410/xewuteposupazuxak.pdfIn PDF document text
    • https://zutofamofiselas.weebly.com/uploads/1/3/4/0/134040676/gafufemab-kugotokakemas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407813/normal_5fa29e0d1aad1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366397/normal_5f92d1900143e.pdfIn PDF document text
    • https://depatimuxuzox.weebly.com/uploads/1/3/4/4/134404048/nofigogenekitadele.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370294/normal_5f8bec61387c8.pdfIn PDF document text
    • https://mazemisa.weebly.com/uploads/1/3/4/6/134692176/mamalevolelinir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393638/normal_5f9b2e4d3358f.pdfIn PDF document text
    • https://maludanojuwido.weebly.com/uploads/1/3/4/5/134591959/zusolorujawas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384299/normal_5f9721cbbef3c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/249185ba-5ca1-4862-91bb-18abdac0d161/gomoguzosapevidipanimavob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/014519e9-98c4-4e7c-a0e4-1d85053c82d7/vupiweven.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4610f1da-9164-4e7d-ad72-fe3a5b76decb/nojelikipeludoti.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_off0000bb5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB5D 5440 bytes
SHA-256: 0a52b792220bd749be8d24038c7d751e9073e563841e83e6d96aa8ab5c712b06
font_01_sfnt_off0000cde4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE4 10384 bytes
SHA-256: 10561e07c4305efeb0322ab689b8df5b3e5e2b767995fc21dabff50b7a86d2cb

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