Malicious PDF — malware analysis report

Static analysis result for SHA-256 713a1a373396bcf4…

MALICIOUS

PDF

72.5 KB Created: 2020-12-21 22:23:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 5f3baace785f8d825b88c67764d8b5c2 SHA-1: 71811859292cf0adcb6faf21ae9ced63aec259c7 SHA-256: 713a1a373396bcf47ae0784d458baf0376e65db8a869a19db350a88e23072a59
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK pointing to 'https://traffmen.ru/strik?utm_term=se+ranking+affiliate+program'. This indicates an attempt to lure users to a malicious site. The ML classifier and ClamAV detection further support the malicious nature of the file, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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=se+ranking+affiliate+program In PDF document text
    • https://cdn-cms.f-static.net/uploads/4380076/normal_5f8ede20c5069.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365551/normal_5f87186ae9983.pdfIn PDF document text
    • https://nuzolegan.weebly.com/uploads/1/3/4/5/134576582/sipisilivijinis_bezikimovatosa.pdfIn PDF document text
    • https://tunuwadubozowe.weebly.com/uploads/1/3/4/3/134363043/0cbc68caf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd06d6cc750a3b5a077ca5/1606223574972/60th_wedding_anniversary_gifts_ideas.pdfIn PDF document text
    • https://s3.amazonaws.com/zuponefi/14680988498.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc30220ec917750a3e588e7/t/5fc849996031f473861a7d43/1606961561675/guzigan.pdfIn PDF document text
    • https://s3.amazonaws.com/doxifuba/amana_thermostat_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/gavobawum/barsaat_1995_full_movie_720p_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/18542027058.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe179acb3e0f577116d2e1/1606293403590/xuzubamob.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/sevepo.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_off0000dd92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD92 5212 bytes
SHA-256: 171bd7075aeb597aed6ef9b5f3080277dde14273472acd278162ca729e81f567
font_01_sfnt_off0000ef43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF43 11164 bytes
SHA-256: 4c09297c334dc1a14de850c5aa4a9c2fa29726aa47258e3efdd59ca2a376f81a

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