Malicious PDF — malware analysis report

Static analysis result for SHA-256 61e43ae91acf4ba1…

MALICIOUS

PDF

68.2 KB Created: 2020-11-17 14:59:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0339d47fcc8bc5c1811e2b0f397c06d1 SHA-1: 7a680fcf58720e8d406404c9d67ab7014a96a6fb SHA-256: 61e43ae91acf4ba1c7c2c7949092a1cf3560cb3e774e211bb6b955ce3f82d8ff
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs suggest a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cctraff.ru/123?utm_term=citizen+eco+drive+e812+manual+espa%25C3%25B1ol
    • https://cdn-cms.f-static.net/uploads/4372073/normal_5fabbea8b607e.pdf
    • https://cdn-cms.f-static.net/uploads/4370528/normal_5f8ede6a13e80.pdf
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/9247351.pdf
    • https://cdn-cms.f-static.net/uploads/4375350/normal_5fa3c99568762.pdf
    • https://dutajidadu.weebly.com/uploads/1/3/4/7/134730474/c62ab695cfd.pdf
    • https://cdn-cms.f-static.net/uploads/4426813/normal_5f9c52bb60401.pdf
    • https://nawowelefet.weebly.com/uploads/1/3/4/4/134498780/nodoximime.pdf
    • https://lonunibulitog.weebly.com/uploads/1/3/4/4/134498578/d1204.pdf
    • https://sivivaleretuvu.weebly.com/uploads/1/3/4/3/134324596/4865949.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7f79d5af-d535-41e5-aac0-538114e9425f/xarupilupanusojunej.pdf
    • https://uploads.strikinglycdn.com/files/445e6f99-6ca6-472b-a7f4-4991ce884dca/eclipse_must_declare_a_named_package.pdf
    • https://s3.amazonaws.com/ravuxudibure/tujawagojapitobak.pdf
    • https://s3.amazonaws.com/fotojipifuzitul/44574534886.pdf
    • https://s3.amazonaws.com/bitizopovopaso/gelokajikev.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0dc.bin
d0268685ce78443ef8f47be5a4b35a6ecaf793c925ad15bd2bd2ff5a9944c71e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC0DC 3184 bytes
font_01_sfnt_off0000cc32.bin
192cb947d774c93f0f6f00be58c4fc8f2d71f758fb6d9e14a7f6b92c5473dc02		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC32 5824 bytes
font_02_sfnt_off0000dfba.bin
b931717b3bf48457046c4a7be53ce318ef33551206834b14f048ff4b914a3e80		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBA 10132 bytes

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