Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bea71c2eef5a3b0…

MALICIOUS

PDF

83.3 KB Created: 2021-03-02 17:13:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: bf74288a4f84ed18f9d4d9ce51063774 SHA-1: c15bad7114a4f27f9cf272b1fdbf36008c8ad46c SHA-256: 9bea71c2eef5a3b0a52525063551dc9b8bca768e48646381428a227f2857dec1
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs and the heuristic firings for PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM confirm the nature of the attack. No scripts were extracted, but the primary attack vector appears to be directing users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://zajinet.ru/strik?utm_term=king+henry+died+drinking+chocolate+milk+song PDF link annotation
    • http://zebrait.fun/214941441326nt0x.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420747/normal_5ffa62be19b79.pdfIn PDF document text
    • https://tobivuzulukimu.weebly.com/uploads/1/3/1/3/131384599/2c1ec320a822c17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366659/normal_600fed80a52e8.pdfIn PDF document text
    • http://naturagrush.space/724413758131h0wu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371523/normal_5febd7a27c471.pdfIn PDF document text
    • https://cdn.sqhk.co/rovifatira/fgjOclZ/horse_run_in_sheds_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/bikakigiben/hjNsjib/nojosi.pdfIn PDF document text
    • https://cdn.sqhk.co/zejizoguzut/haVwgha/19169556439.pdfIn PDF document text
    • https://cdn.sqhk.co/tirazirevemu/dRgeFib/demikizunu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478926/normal_5fd9c946d9a7e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426676/normal_6005c1aaebe13.pdfIn PDF document text
    • http://musofiron.ru/bournemouth_football_ground_guidew1195.pdfIn PDF document text
    • https://cdn.sqhk.co/ketejeti/dEUP5Fz/luvozakoref.pdfIn PDF document text
    • https://molikosa.weebly.com/uploads/1/3/4/0/134017769/rimive_dikogagolalofan_rumikepupiroso_mipesokenegigi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001045e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045E 5488 bytes
SHA-256: be92c696dadbdc5e5b8648107fb24189ee80f3442c66fb7472633d3f9dd80153
font_01_sfnt_off000116e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E9 12064 bytes
SHA-256: 1921aae1c65d7370277e6e597750048c6ee6759cde309405a1d65057646f0726

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