Malicious PDF — malware analysis report

Static analysis result for SHA-256 6736faa931ecbf35…

MALICIOUS

PDF

77.8 KB Created: 2021-02-07 09:40:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 3b69565a28e260e1f11895a966537f4c SHA-1: 944b901d2e99f5e1f9fc0685f81764c1413cf809 SHA-256: 6736faa931ecbf35da38d64aea352153038d6ad8d53e6b28dd425ad587114af6
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, flagged as a link farm, suggesting a phishing or SEO manipulation attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

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://maypoin.ru/123?utm_term=drinking+water+fountain+covers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4457577/normal_5fd83629033ec.pdfIn PDF document text
    • https://cdn.sqhk.co/dasisogi/ATii4oX/5635305865.pdfIn PDF document text
    • https://cdn.sqhk.co/dofewijoras/jxnIsjc/24428129577.pdfIn PDF document text
    • https://mejodedasebedo.weebly.com/uploads/1/3/4/7/134725949/50126440.pdfIn PDF document text
    • https://lubafotet.weebly.com/uploads/1/3/1/3/131380208/dupobilejax.pdfIn PDF document text
    • https://weginufakitin.weebly.com/uploads/1/3/4/8/134846544/7807210.pdfIn PDF document text
    • https://cdn.sqhk.co/gafisasiwu/96CQrKe/mr_katana_wagyu.pdfIn PDF document text
    • https://cdn.sqhk.co/kixowijeka/1iihil7/junudodemunopivejawu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409102/normal_5ff970be47543.pdfIn PDF document text
    • https://xuvasilibozin.weebly.com/uploads/1/3/5/3/135335949/vuwawibetoxolo.pdfIn PDF document text
    • https://cdn.sqhk.co/zoxemetakol/lYJWghp/save_the_planet_organizations.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381344/normal_5ffd1d9c18e67.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459329/normal_5ffa56f5e5bb1.pdfIn PDF document text
    • https://cdn.sqhk.co/fubafonu/Thhcsam/venogurov.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/megodipewukitoj/anet_a8_plus_firmware.pdfIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/barasesawa.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/exclusive_management_agency_agreement_nsw_form.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_off0000f498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF498 5232 bytes
SHA-256: df8df851012eba0f5f1b06d832c7c76e2aff772deb3ed12aa9ae2eeaf7633501
font_01_sfnt_off000106a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A3 10404 bytes
SHA-256: 5a22cc31c6cc28f26722b2365e1e409b5f9a2eacf71251d62271fbfca2861f6b

Open this report in the interactive analyzer, or submit your own file for analysis.