Malicious PDF — malware analysis report

Static analysis result for SHA-256 86081a972d8e88d1…

MALICIOUS

PDF

64.7 KB Created: 2021-01-08 11:39:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 0e985ca245c1e1aa128d2e42632396c9 SHA-1: ecd26f6dbea15b6697c840226d9d0af8eb2c176d SHA-256: 86081a972d8e88d1ceb9c965d0dfe3e9b2cdacd6951803aef5c6165751e397c7
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, with critical heuristics indicating it is a malicious redirector link farm. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the presence of numerous links suggests an attempt to redirect users to potentially malicious content, possibly for phishing or malware distribution.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffking.ru/123?utm_term=beretta+a391+xtrema+2+disassembly In PDF document text
    • https://wudivaju.weebly.com/uploads/1/3/4/7/134762352/0766e.pdfIn PDF document text
    • https://cdn.sqhk.co/ralapogifur/cWtdhe7/gepizitejuxenugune.pdfIn PDF document text
    • https://cdn.sqhk.co/jefapukawore/h0SAhcy/68351093123.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474987/normal_5fb43c86cde4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385862/normal_5fb2a1268b978.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/3cb113af6.pdfIn PDF document text
    • https://cdn.sqhk.co/gadukupuwe/1gjGifw/78966921467.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4a0b63b-342d-4080-aab0-3f73c93d5194/sozoxotezewawulowix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/973c4fbf-c38f-44c3-84a1-74840bedb53c/32064254735.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba512021-4c24-4e48-832e-664376cc61a5/3935596441.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37367a5f-1e68-4fd2-8381-6b2d3593ffbf/taxivofonulojefilo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e70cfc82-b1d2-4edb-bcbe-668874f076af/awesome_tanks_4_game.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_off0000bd3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD3E 5832 bytes
SHA-256: b96c5a2d0aad3eb664d4beb56319e5c2734742949cdd532dbe5b5e5b7ebcdd6d
font_01_sfnt_off0000d105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD105 10900 bytes
SHA-256: 0cebcd42b92d940d1246e32d54834680aa45fa2012c4897106faa089ccd86a80

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