Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfe8a409813a0c76…

MALICIOUS

PDF

78.8 KB Created: 2020-11-11 20:31:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5ee63f29ece97c3a632d2cd072f2620 SHA-1: 125fae54785b99301d0badce222b8b2f793102fc SHA-256: bfe8a409813a0c76ab878407a7298de0478316f0e3b105d521c858d8795fa111
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains numerous external links, with one pointing to 'trafffe.ru', suggesting a link farm or phishing attempt. The PDF structure itself is also suspicious, with duplicate object definitions, and the presence of embedded URLs further supports a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9881

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://trafffe.ru/123?utm_term=stages+of+moral+development+in+educational+psychology
    • https://tevirilozarenov.weebly.com/uploads/1/3/2/6/132695732/xamakixujaripun-mutix.pdf
    • https://zepixufiguw.weebly.com/uploads/1/3/4/1/134108583/8397683.pdf
    • https://cdn-cms.f-static.net/uploads/4418579/normal_5f97a242f0c67.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0210dfad-b71b-432f-a00a-fd94965bb886/jim_crow_laws_vs_black_codes_worksheet_answers.pdf
    • https://s3.amazonaws.com/jamuluvuvava/mopexokudupekojeso.pdf
    • https://s3.amazonaws.com/niporofez/71435123337.pdf
    • https://s3.amazonaws.com/bugutaj/20551954990.pdf
    • https://s3.amazonaws.com/faluzotixupi/12255428051.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_off0000f87d.bin
41fac17c7c0c9d1e1997fa577cfe8112dbf7f9a003f5cea3b7e77f8cbf748e5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF87D 5832 bytes
font_01_sfnt_off00010c41.bin
29368027eff86d84355b68ed606cd11133e2508a62566d54829b82fdd77f0ad2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C41 10056 bytes

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