Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8f1338d1b00e991…

MALICIOUS

PDF

79.4 KB Created: 2021-03-13 21:04:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c9b88be19e1de24ebc9bb2138b55680 SHA-1: 2e9ad794b4cf75cfc7b4c2ee920c6d66e2766039 SHA-256: b8f1338d1b00e9917b74064e63f6c99100a327df127975ca5926d5527aee6ad7
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-themed, suggesting a link farm or redirection scheme. ClamAV and ML classifiers identified the file as malicious, specifically as a phishing trojan. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' indicate the primary goal is to drive traffic to external sites, likely for malicious purposes such as phishing or malware delivery.

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-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
  • 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://druttle.ru/award?keyword=advantages+of+triple+bottom+line+pdf
    • http://draiwenstore.online/747706354739hljp.pdf
    • https://fidifeso.weebly.com/uploads/1/3/1/4/131408027/7065063.pdf
    • http://reduslim-sito.site/angularjs_2_tutorial_w3schoolszj398.pdf
    • https://musisemikalig.weebly.com/uploads/1/3/4/6/134694348/bc75d7.pdf
    • https://sowefitubi.weebly.com/uploads/1/3/1/4/131406610/6333497.pdf
    • https://saboruxeketeg.weebly.com/uploads/1/3/4/8/134850947/xufepor_bomibodago_bokamabu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tejuvonixag/hazardous_waste_management_plan_template.pdf
    • https://s3.amazonaws.com/vapite/62673507924.pdf
    • https://86042ffc-9b62-460b-8552-fb2522205a17.filesusr.com/ugd/4f92c1_cf0a3678f1374c55b517a69b355b9cb4.pdf?index=true
    • https://a3c35cc3-4a3f-4d41-ab51-8b3e4b114d30.filesusr.com/ugd/2b25b5_e38ddf5ae3ed4c1089f14e7438090c9b.pdf?index=true
    • https://s3.amazonaws.com/xajowu/susivexipet.pdf
    • https://s3.amazonaws.com/kosipefojaw/47257755350.pdf
    • https://c1cb471f-fc5c-4ef2-b3e1-4d0d0d09d135.filesusr.com/ugd/cc5b41_a5db7287ba3c40609fb1687d27d1bcaa.pdf?index=true
    • https://18cb0a1d-3822-48a5-9ca0-56465202bc9b.filesusr.com/ugd/96564c_114f664969ba49c683b8d85a62e1e74a.pdf?index=true
    • https://s3.amazonaws.com/kiguteperilodu/51726577325.pdf
    • https://s3.amazonaws.com/dikomavomem/is_there_monsters_vs_aliens_on_netflix.pdf
    • https://6f2fb29c-15f2-4b08-b525-3eb91a7f0a41.filesusr.com/ugd/c3548c_a21d7761449d4cc5aa8f59f0966dbc14.pdf?index=true
    • 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_off0000f6ad.bin
23f066195f47049740b35c1e938b025a13269419c3c2664cb7c12ad67714c9fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AD 5548 bytes
font_01_sfnt_off0001097f.bin
3bd3e6f021e8c5ba9434fa8d6f4ff35f9c0fec11e1397186982751bc0fa0092b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1097F 11444 bytes

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