Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b4cac8a8614c115…

MALICIOUS

PDF

67.0 KB Created: 2020-12-08 13:08:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: ca0304ee4ecf87d5c632b7606cbdd08e SHA-1: 18131d4c8e0d2cbfa688844ac9ab81742fd92c5d SHA-256: 7b4cac8a8614c115007c5d2e057c18083a9199f22b1099bb3464ea5cc434a63d
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting it is part of a link farm designed to manipulate search engine results. The embedded URL 'https://traffset.ru/strik?utm_term=iron+man+2+poster+obama' and the presence of PDF_SEO_LINK_FARM heuristics indicate a phishing or SEO manipulation attempt. While no scripts were extracted, the overall structure and link farm activity strongly suggest a malicious intent to redirect users to potentially harmful content.

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://traffset.ru/strik?utm_term=iron+man+2+poster+obama PDF link annotation
    • https://siminanora.weebly.com/uploads/1/3/4/6/134611077/5fa314f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413718/normal_5f9f8dc5697a6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383678/normal_5fc41204cc3ce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379485/normal_5fcad5d116d1b.pdfIn PDF document text
    • https://lujogisuz.weebly.com/uploads/1/3/4/9/134904514/zalosawirab.pdfIn PDF document text
    • https://xilorufanil.weebly.com/uploads/1/3/0/7/130739938/9058149.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406170/normal_5faa878f08770.pdfIn PDF document text
    • https://deremufirig.weebly.com/uploads/1/3/4/8/134854029/nidatatem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386354/normal_5fafdfe395b11.pdfIn PDF document text
    • https://fabuduviwanor.weebly.com/uploads/1/3/4/7/134739750/6292653.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403824/normal_5fad78953f5c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424007/normal_5fba7cd6ef644.pdfIn PDF document text
    • https://gexumuvebevo.weebly.com/uploads/1/3/4/3/134312536/zudepetima-karabakim.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/1e16d238-75dd-48ad-8ea9-56836583000a/oblivion_mod_guide.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc7a7518651a04751993a6e/t/5fcc1424260a660a6bc96bd4/1607210020782/jataxubovanoluzuvomagutob.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_off0000c839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC839 5140 bytes
SHA-256: 8e45771c0cd126ad55a41b128781456fea04d25d7fc0d60dce4219a9ed35cec2
font_01_sfnt_off0000d992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD992 11152 bytes
SHA-256: 71a38e37f52c54ea71bc57945b401b553de87793487ed510c65f06861400f11f

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