Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fb42248fcea2652…

MALICIOUS

PDF

66.2 KB Created: 2020-12-02 11:40:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 406fb55021cec2392d03182bce36ce4c SHA-1: 6fea7848e23fae6e8634cedd6085fcda2d9e3afb SHA-256: 1fb42248fcea2652588302e51ccd9204b2bf12351c3b6f859d9e1d9437f52ca0
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of a PDF link farm heuristic and numerous external URLs suggests a phishing or SEO manipulation attempt. While no scripts were explicitly extracted, the nature of the PDF and the heuristics point towards an attempt to redirect users to potentially malicious or deceptive content hosted on external domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffnew.ru/123?utm_term=what+is+a+conundrum+in+science
    • https://ditiwudo.weebly.com/uploads/1/3/1/4/131452947/0d39061d8cce.pdf
    • https://cdn-cms.f-static.net/uploads/4368504/normal_5f9cb5d84a220.pdf
    • https://cdn-cms.f-static.net/uploads/4370074/normal_5fbb1466de7ff.pdf
    • https://rabidibizuzej.weebly.com/uploads/1/3/4/6/134648686/sukajefupanaxa.pdf
    • https://cdn-cms.f-static.net/uploads/4384471/normal_5fbf3e0083efe.pdf
    • https://cdn-cms.f-static.net/uploads/4489247/normal_5fb2544aed818.pdf
    • https://cdn-cms.f-static.net/uploads/4408485/normal_5f9a88ddd4864.pdf
    • https://cdn-cms.f-static.net/uploads/4385434/normal_5fbab7b8c831b.pdf
    • https://cdn-cms.f-static.net/uploads/4380681/normal_5f989cb373e2d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc0e727ea4a794d5645064f/t/5fc4adfd173fb5383b37e49e/1606725119447/e_natural_minor_scale_guitar.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf8eadae50a014586e948/1606220010985/pajuvekotelogeg.pdf
    • https://static1.squarespace.com/static/5fc100ee92c50b1a1e781c95/t/5fc21b009d79364840d596a5/1606556417155/40720672823.pdf
    • https://static1.squarespace.com/static/5fc66f49a13a450bab1a5f60/t/5fc69a38bc819f1cf4bfdb6e/1606851128650/subibovejagomunexonita.pdf
    • https://uploads.strikinglycdn.com/files/baf9f95b-a104-4d34-b9e3-71d9d0b4a49b/rebuse.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c757.bin
55d5205c3ff61a7d6f570a6b9175532fee2863403b3cffee5e1c909df2adc2b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC757 5160 bytes
font_01_sfnt_off0000d8c2.bin
48875558d0c648571ffaea1cc5bde7615c7f0466cc9dd5d46247dccbd9dbc9f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C2 10300 bytes

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