Malicious PDF — malware analysis report

Static analysis result for SHA-256 131d7c9657472607…

MALICIOUS

PDF

75.0 KB Created: 2021-02-21 10:58:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4299c7c407f00fccd8682638f74d428 SHA-1: 711466fb5ea68014adce070562f512acbda650ae SHA-256: 131d7c9657472607c6a9425995073d586e32bed700abda77078f20a87e6132cf
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 firings reveal a PDF containing a mass external link farm, with numerous URLs pointing to other PDF documents. The primary embedded URL, https://maypoin.ru/wix?keyword=timeline+for+romeo+and+juliet+important+events, suggests a lure related to search engine optimization or content manipulation. The presence of multiple PDF links, many with numeric slugs, strongly indicates a link farm designed to distribute traffic to potentially malicious or phishing sites.

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://maypoin.ru/wix?keyword=timeline+for+romeo+and+juliet+important+events
    • https://cdn.sqhk.co/banamasuvaj/eUppzia/3962654840.pdf
    • https://sitimewodojex.weebly.com/uploads/1/3/1/8/131856527/vawidoxexelokil.pdf
    • https://cdn.sqhk.co/vujenibolo/hfd5vjj/metal_slug_attack_iron_fortress.pdf
    • https://cdn.sqhk.co/kupejabel/c9NSib4/16527251525.pdf
    • https://cdn.sqhk.co/sepagumal/hjw6ngi/64334417869.pdf
    • https://cdn.sqhk.co/bedepekemat/jajctk0/zawunigusogal.pdf
    • https://cdn-cms.f-static.net/uploads/4473656/normal_6014ab3c2cc6f.pdf
    • https://static.s123-cdn-static.com/uploads/4446776/normal_60048e0068d48.pdf
    • https://boxagabopevonud.weebly.com/uploads/1/3/4/3/134353696/fffc583665.pdf
    • https://cdn.sqhk.co/jemajujo/QgeIgjs/hp_smart_tank_plus_651_software.pdf
    • https://cdn.sqhk.co/novimabe/fSicgeu/mega_man_mobile_gameplay.pdf
    • https://static.s123-cdn-static.com/uploads/4475875/normal_5fcb25c0949aa.pdf
    • https://cdn.sqhk.co/jujuziwe/e2hdieM/pretty_girl_jewelry_puzzle_puzzle.pdf
    • https://cdn.sqhk.co/xuxawexa/gfOjbgg/kevevikitowekijunix.pdf
    • https://zudiwimuda.weebly.com/uploads/1/3/1/4/131438079/waxalejodowilu.pdf
    • https://cdn.sqhk.co/ligumorik/awibRjj/export_contacts_for_whatsapp_mod.pdf
    • https://cdn-cms.f-static.net/uploads/4417220/normal_601b9bfbe2a9d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000e991.bin
c573cfdd747d5f744779dc1107410c1b0669a7ea0a54b94589260b1c3397a3a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE991 5272 bytes
font_01_sfnt_off0000fb70.bin
a72acc2bebb8dc3bb7310f5fe8eb8019fd3f39031816f35d6273bf55942d1d1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB70 10328 bytes

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