Malicious PDF — malware analysis report

Static analysis result for SHA-256 80ac1401278ccefc…

MALICIOUS

PDF

101.6 KB Created: 2020-12-06 23:03:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3053d137bd2f7df3e16b0deb48ad04e7 SHA-1: ab93577545e93d4b03abfdde7f76b3e662ff44f7 SHA-256: 80ac1401278ccefccecf962a581ecd1bb0851f3ef0c736f741228e548510e8e8
154 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' pointing to a suspicious URL. The ClamAV detection and ML classifier also indicate maliciousness. While the document body is heavily obfuscated, the presence of external links suggests an attempt to redirect the user to a potentially malicious site, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9542

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffnew.ru/aws?utm_term=guided+tours+through+costa+rica
    • https://static.s123-cdn-static.com/uploads/4373243/normal_5fc9de374ad91.pdf
    • https://cdn-cms.f-static.net/uploads/4450251/normal_5fb419c440ad9.pdf
    • https://cdn-cms.f-static.net/uploads/4452374/normal_5fa7401526a14.pdf
    • https://cdn-cms.f-static.net/uploads/4367650/normal_5f9a6b470466f.pdf
    • https://tepunejor.weebly.com/uploads/1/3/4/6/134636279/laboxetipitupobepexi.pdf
    • https://cdn-cms.f-static.net/uploads/4381104/normal_5fa6b0e813744.pdf
    • https://cdn-cms.f-static.net/uploads/4420756/normal_5fac43204f48e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wizedumi/jaxunejexudol.pdf
    • https://s3.amazonaws.com/kulinisokakewi/aumento_de_bilirrubina_directa.pdf
    • https://static1.squarespace.com/static/5fc5d3e7a87939686429f1a7/t/5fcaaee1f29eb94b23c35dae/1607118561402/mini_golf_world_championship_hastings.pdf
    • https://s3.amazonaws.com/sebunuzu/36884476940.pdf
    • https://s3.amazonaws.com/tokafanawa/how_to_submitted_passport_application_form.pdf
    • https://static1.squarespace.com/static/5fc10dd588c99b6d37a7fa85/t/5fc64d7108845d0924614db6/1606831474042/call_of_mini_dino_hunter_mod_apk_2019.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000168ed.bin
998d570dc3dce2d11f0507b156bcb5c510bb7e33d6c5648340294d31f60cb7ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x168ED 5200 bytes

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