Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f14b8ad5bc31824…

MALICIOUS

PDF

76.4 KB Created: 2021-03-02 17:39:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c542fb0694d74d12267704eff34c7796 SHA-1: d74d8b422c6d3f868eb800ab54b45e75947cb21b SHA-256: 0f14b8ad5bc31824dc2dbb145808360ba4e8bf8d9f05819e10a713b84f14711c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to other PDFs, indicative of a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and heuristic firings point towards the distribution of malicious content via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://xezojetit.ru/123?utm_term=reading+comprehension+questions+and+answers+for+bank+exams
    • https://fogisitulen.weebly.com/uploads/1/3/0/7/130775537/retorenatal-gokadapekomu.pdf
    • https://cdn.sqhk.co/ganuniwiku/gcibhyc/87699006024.pdf
    • https://static.s123-cdn-static.com/uploads/4411696/normal_6007377498de1.pdf
    • https://cdn.sqhk.co/goluxewimabu/if8ggjj/rezomeduwa.pdf
    • https://cdn-cms.f-static.net/uploads/4453909/normal_601dd4380f25b.pdf
    • https://cdn.sqhk.co/gobajejuz/mdjcijd/wabavuzuk.pdf
    • https://cdn-cms.f-static.net/uploads/4368235/normal_601cbc045b7c7.pdf
    • https://static.s123-cdn-static.com/uploads/4464077/normal_5fcc8fff7bdc1.pdf
    • https://static.s123-cdn-static.com/uploads/4420020/normal_60052c19a9224.pdf
    • https://bobovisosusare.weebly.com/uploads/1/3/5/3/135394734/4569298.pdf
    • https://cdn-cms.f-static.net/uploads/4446923/normal_5fea18cf25d50.pdf
    • https://mokenexub.weebly.com/uploads/1/3/4/4/134478104/xizemune-senopip-boterikuwexag-xovivi.pdf
    • https://wumifidadorubip.weebly.com/uploads/1/3/5/2/135298964/682dc396a0.pdf
    • https://cdn-cms.f-static.net/uploads/4420589/normal_60120f0a2e407.pdf
    • https://cdn.sqhk.co/buzulexoxuve/gegijh8/vawabolifogaliwibagi.pdf
    • https://cdn-cms.f-static.net/uploads/4427529/normal_6021d3071ff71.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lopeteb/leaves_coloring_template.pdf
    • https://s3.amazonaws.com/nedijowewoded/18639930262.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_off0000e99b.bin
e1bcf9934dc6749c3a3925c85cd89767a84bb15c2bcc5355f400fc379a91b051		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE99B 6032 bytes
font_01_sfnt_off0000fe17.bin
b1b1eba264084b52e65c9ced3500a97a6fed953261b1f49c42663218c281927c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE17 11212 bytes

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