Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2d665c88c6ac71a…

MALICIOUS

PDF

75.4 KB Created: 2020-12-04 02:54:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 88c29d3eb521f5787105c8fc95cde9fa SHA-1: 525cd7dcb171d7c67997b265f7ab8c786dca5b69 SHA-256: d2d665c88c6ac71a0d5c322a08265225f1ae671b61f4c2daf216d0d60fc343b4
154 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm with numerous external URLs. The heuristic PDF_SEO_LINK_FARM indicates a high volume of links, suggesting an attempt to manipulate search engine results or redirect users to potentially harmful sites. While no scripts were explicitly extracted, the nature of PDF malware often involves embedded JavaScript for malicious actions, hence T1059.007 is included.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9661

Heuristics 4

  • 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
  • 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://traffking.ru/aws?utm_term=cdc+guidelines+hep+b+exposure
    • https://cdn-cms.f-static.net/uploads/4366367/normal_5fafbe22dceed.pdf
    • https://jowizixevudaw.weebly.com/uploads/1/3/4/4/134489406/2687176.pdf
    • https://cdn-cms.f-static.net/uploads/4366377/normal_5f8deb7864b90.pdf
    • https://dikefurilixi.weebly.com/uploads/1/3/4/6/134684794/ff7bbd2a3fc689.pdf
    • https://cdn-cms.f-static.net/uploads/4458839/normal_5fade6f85af05.pdf
    • https://cdn-cms.f-static.net/uploads/4369166/normal_5fb9ecf4437b6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e8bb15ff-345a-4320-9307-95ac67167337/45799581114.pdf
    • https://s3.amazonaws.com/tetazino/sample_persuasive_paragraph.pdf
    • https://s3.amazonaws.com/vaxebisapesi/vafevolomos.pdf
    • https://uploads.strikinglycdn.com/files/0a343864-cc9d-4601-ac96-c951e86dfb06/vutubezun.pdf
    • https://uploads.strikinglycdn.com/files/31e72a9a-4bc2-4995-8367-1d4783a7e276/football_uniform_generator.pdf
    • https://s3.amazonaws.com/vuforewebub/zazeforetixaneberukapo.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010dd0.bin
90c667bed632105e67d6517958c70e0e17f49ee3046f9c812568407ca2812e41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD0 5236 bytes

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