Malicious PDF — malware analysis report

Static analysis result for SHA-256 62c479ad4f513a13…

MALICIOUS

PDF

76.2 KB Created: 2021-05-25 12:47:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 493dca82483d08613821f67b25a89119 SHA-1: 1d3685d0e4a1329cd1dbe2f957afd3343448593b SHA-256: 62c479ad4f513a13f6b0d943376afa51c1a5aa01aa0a552496a1f1a629be7451
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for phishing or malware distribution. The primary URL, https://jacksth.ru/strik, is likely intended to host a malicious payload or redirect to a phishing page. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to manipulate search engine results or distribute content broadly. The ML classifier and ClamAV detection strongly indicate malicious intent.

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-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://jacksth.ru/strik?utm_term=call+of+duty+companion+app+apk
    • https://cdn-cms.f-static.net/uploads/4446401/normal_60358189e9146.pdf
    • https://kuvuwivozud.weebly.com/uploads/1/3/6/0/136091804/fozawidapokikowixu.pdf
    • https://tubozabuzimez.weebly.com/uploads/1/3/4/8/134878922/penewituk.pdf
    • https://cdn-cms.f-static.net/uploads/4490539/normal_6037591fcef59.pdf
    • https://turulogir.weebly.com/uploads/1/3/4/6/134641543/sapizufomi.pdf
    • https://static.s123-cdn-static.com/uploads/4416132/normal_60043eec1643a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/bee5838c-a5d4-4080-8d38-eaaccf930d56/suntrust_auto_loan_payoff_address_overnight.pdf
    • https://uploads.strikinglycdn.com/files/2cf73c7b-8725-4a80-88c7-5b3d27891320/what_to_bring_to_car_inspection_ma.pdf
    • https://uploads.strikinglycdn.com/files/b5f171ff-d047-4ea2-9568-766878987cf7/can_police_retrieve_snapchats.pdf
    • https://s3.amazonaws.com/niwotipugonuvoz/64852546220.pdf
    • https://uploads.strikinglycdn.com/files/e312c87a-f463-41e5-9642-e2ac78e31526/56811034967.pdf
    • https://uploads.strikinglycdn.com/files/2683dd32-8e6f-400e-953f-4d12f9e7e496/cisco_ccna_200-301_exam_cost_in_india.pdf
    • https://uploads.strikinglycdn.com/files/00212198-b3ae-45ad-aca8-0c87a5d0394d/luwawokonunexukixi.pdf
    • https://uploads.strikinglycdn.com/files/c7a58504-2121-4bb0-b4cb-a63182d4046a/baromoxovek.pdf
    • https://uploads.strikinglycdn.com/files/e5f3a7ac-25df-4dec-a87d-c220090cfebb/41260519043.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfde.bin
5df190b0c11adfc05aef5e0526faca61406ca69559d8f95308368a1dbb9041ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDE 4980 bytes
font_01_sfnt_off0000f0cc.bin
c79bbc5e594a988d86c7757f44f1743d18b34617a27750c0b32d840657cd73b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CC 10336 bytes
font_02_sfnt_off00011408.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11408 4324 bytes

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