Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca25c4978d9485e8…

MALICIOUS

PDF

84.5 KB Created: 2021-01-04 19:16:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1711994e07bc45f65f642c78ba2f8ee2 SHA-1: dc6b4cd48a1bd9fa65cb4ddc9365790255806880 SHA-256: ca25c4978d9485e803fe3a1c3d6586b3885cd0ac9264edc2bdb6aa9e331e0360
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document is designed to host numerous external links, likely to phishing sites or further malware. The embedded URL 'https://traffnew.ru/aws?utm_term=css+grid-+template-+columns+fr' is part of this link farm, potentially serving as a lure or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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/aws?utm_term=css+grid-+template-+columns+fr
    • https://static.s123-cdn-static.com/uploads/4455178/normal_5fe0c3003c5bc.pdf
    • https://lodirunesu.weebly.com/uploads/1/3/0/8/130874391/9225f5590a2.pdf
    • https://static.s123-cdn-static.com/uploads/4417645/normal_5fdfa06639546.pdf
    • https://cdn-cms.f-static.net/uploads/4475216/normal_5fb7d6437e88e.pdf
    • https://cdn-cms.f-static.net/uploads/4372955/normal_5f89ff86be712.pdf
    • https://cdn-cms.f-static.net/uploads/4478134/normal_5fb2df0fdada8.pdf
    • https://cdn-cms.f-static.net/uploads/4407060/normal_5fdbbfa7f1df3.pdf
    • https://static.s123-cdn-static.com/uploads/4458421/normal_5fecd5b282cfe.pdf
    • https://cdn-cms.f-static.net/uploads/4408983/normal_5f93852a754d9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/jepavilutabilel/database_administrator_interview_questions.pdf
    • https://s3.amazonaws.com/nevowimo/lixawitumapuwozawadexena.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbcd.bin
bb99fa0aaa8dd1fbc7d2b994d53fd752a680e50ba46eea670d64842508cab23f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCD 16592 bytes
font_01_sfnt_off0000fe2a.bin
b8417d30bed392a258b2b434dd9fb7196f3eed47b0a4450c15ac651bbefbf6b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2A 5412 bytes
font_02_sfnt_off0001107e.bin
0d57e44021b7a2ea2fa1065f29b68792539fe3349ff30654e5e4403dc68e370f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1107E 11204 bytes
font_03_sfnt_off000136d3.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x136D3 4324 bytes

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