Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d5ff891f3ea0ad5…

MALICIOUS

PDF

67.3 KB Created: 2021-01-25 11:15:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 039992bf7d9de9e7173f2a86c8ea5a77 SHA-1: ed4eb36cc0e375181e13b5268d2d27a9e3fa0038 SHA-256: 6d5ff891f3ea0ad5e82cc0bb6648ae6bb953f7308259f279c4b46d4b47e6aeb4
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI that redirects to a suspicious domain, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a common phishing lure, likely aiming to redirect the user to a malicious site for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://seumenha.ru/123?utm_term=the+brown+man%2527s+burden+questions+and+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4481282/normal_5ff344c98344a.pdfIn PDF document text
    • http://azorocheat1.xyz/13175789095k68ef.pdfIn PDF document text
    • http://kifikawi.66ghz.com/nebozazun.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368972/normal_5ffc83c6cc71a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420752/normal_5fc98cb517e77.pdfIn PDF document text
    • http://santecmb-sarl.com/5796470920nqipe.pdfIn PDF document text
    • http://sowaviwexurejo.22web.org/vexexalexasewagu.pdfIn PDF document text
    • http://lamorebeduzakoj.22web.org/9759573158.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mulerux/gakatonivobonolu.pdfIn PDF document text
    • http://robowogutalopet.epizy.com/budgeted_cost_work_performed.pdfIn PDF document text
    • http://pavinudoj.epizy.com/vobotuwiwoguladatiwawun.pdfIn PDF document text
    • https://s3.amazonaws.com/wonumafubij/lozinerexivozafasibowon.pdfIn 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_off0000ca4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4E 5376 bytes
SHA-256: f0c89b670861157cd8dcef70a12ec89059fb1faa63101c6abbe468a401420050
font_01_sfnt_off0000dc75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC75 10556 bytes
SHA-256: 3e5c9004f9f42d5bf8d377737c82e44d85885db973deb8e8d927b77381bdac19

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