Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb74c7890849e40d…

MALICIOUS

PDF

65.6 KB Created: 2020-11-19 14:21:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 8f25b8e0e3a95398b850c346e2fb20db SHA-1: 1f5e85b08d9c48ec8d7802793a04b3677b85d373 SHA-256: cb74c7890849e40d9b448269d0c2b6037efca674b15b34953ae2cf48e65ed654
244 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to disposable hosting services and redirectors, indicating a link farm designed to lead users to malicious sites. The presence of a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK and the ML classifier's high confidence score further support this assessment. The document's content, though obfuscated, appears to be a lure related to video game 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
  • 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://traffmen.ru/strik?utm_term=rock+band+unlock+all+songs+xbox+360 In PDF document text
    • https://xikagarema.weebly.com/uploads/1/3/4/4/134489929/21d7a7b33491929.pdfIn PDF document text
    • https://wepusiviji.weebly.com/uploads/1/3/4/6/134661614/12965ba093.pdfIn PDF document text
    • https://sevivuninuk.weebly.com/uploads/1/3/4/4/134459749/3902112.pdfIn PDF document text
    • https://sizasaligibi.weebly.com/uploads/1/3/4/5/134506534/1984906.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448733/normal_5fa058b1686ae.pdfIn PDF document text
    • https://nopirirog.weebly.com/uploads/1/3/4/2/134234714/8114172.pdfIn PDF document text
    • https://kavaxaxogemiren.weebly.com/uploads/1/3/4/4/134441995/titepegoge.pdfIn PDF document text
    • https://mufedagejex.weebly.com/uploads/1/3/4/7/134726032/3d21f99.pdfIn PDF document text
    • https://xikudamoxi.weebly.com/uploads/1/3/4/5/134576601/1189591.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369928/normal_5f990f8484c90.pdfIn PDF document text
    • https://fepaxumezo.weebly.com/uploads/1/3/4/3/134320712/sipawesajena-wumivupoban-vabubegeta-fapawubezetot.pdfIn PDF document text
    • https://punotajevi.weebly.com/uploads/1/3/4/2/134266109/jexegefep-batix.pdfIn PDF document text
    • https://pidadilux.weebly.com/uploads/1/3/4/6/134666204/sesakaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415783/normal_5fb4ea1c7737a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472773/normal_5fa5d1e02df0a.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC217 5752 bytes
SHA-256: 44b54eafb7a48e42ce2a601ff627ec8f1946d6b381a8fbf3296d4e24d521bd65
font_01_sfnt_off0000d5c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C3 10452 bytes
SHA-256: 58c91459daa6eae737911e94448c8871d18cd44e20c91821dcb8349416be4c2c

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