Malicious PDF — malware analysis report

Static analysis result for SHA-256 c87912ef0d751ba5…

MALICIOUS

PDF

65.0 KB Created: 2020-12-23 08:17:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 0d3d8ed28b1ed5977d17caa14f2e87aa SHA-1: 78ad27d714f005ed24a9d5c83b2beed1bccb3e9c SHA-256: c87912ef0d751ba5fe2d0d52810f2a81c36c768bfc84a2312abc689dd93bb8c6
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to distribute further malware. The presence of numerous external PDF links suggests a link farm or a method to obscure the final destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/123?utm_term=polk+monitor+60+series+ii+crossover In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367310/normal_5f8829cfd6875.pdfIn PDF document text
    • https://tagekoworiz.weebly.com/uploads/1/3/4/0/134016686/20f6cb36c5.pdfIn PDF document text
    • https://letazofuwukuge.weebly.com/uploads/1/3/4/8/134869061/4937926.pdfIn PDF document text
    • https://suranetu.weebly.com/uploads/1/3/4/4/134458043/bazuwupabaxa.pdfIn PDF document text
    • https://fajorisovobune.weebly.com/uploads/1/3/4/7/134752278/gavizofom_tanizoji_vaxevid_vuvelema.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413000/normal_5fbf5f3a4c131.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420597/normal_5f9d3a73ca4f0.pdfIn PDF document text
    • https://dolojimopa.weebly.com/uploads/1/3/4/8/134887070/c032e4cab61f56.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/5fcef73ba633b27d3ae59ac9/t/5fd1c3f4ae71ea6dd31f2597/1607582708284/neon_flower_wallpapers_for_mobile_phones.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0d00e405d5340f3291e5b/t/5fc0e5f4a97599144e183127/1606477305122/mibulerereboro.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_off0000c505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC505 5156 bytes
SHA-256: 1512d6d16bf06f6d63a956cfa95a2fed451b578cd4e256d6679a047ebf773f78
font_01_sfnt_off0000d685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD685 9604 bytes
SHA-256: 3e07612597b8a67878df1e4e056a74bd1bdc1a5ec6278904a128ea7aef0cc6ca

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