Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb3f5c4804e99e73…

MALICIOUS

PDF

68.5 KB Created: 2021-01-25 14:56:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 010d0e6b7f3002e60ac0f854b87ba67b SHA-1: 0707c83d5d4fd486496a1bae76b493a5f8d5d318 SHA-256: cb3f5c4804e99e739121fad11b85c3189ad8c6e96d6f4834e557341ffa51d096
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, forming a link farm, which is a common tactic for SEO manipulation or distributing malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful websites, likely for phishing or malware distribution.

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://seumenha.ru/wb?keyword=survival%20backpack%20kit%20diy PDF link annotation
    • https://baxorejo.weebly.com/uploads/1/3/5/2/135295822/4614831.pdfIn PDF document text
    • http://phtech.site/myat_t_business_experienceg5ckt.pdfIn PDF document text
    • https://mubonunegaj.weebly.com/uploads/1/3/0/8/130874179/5e3bcaed.pdfIn PDF document text
    • https://tamukatiraf.weebly.com/uploads/1/3/4/7/134766395/perejugum-janonivivow.pdfIn PDF document text
    • https://benodamefeju.weebly.com/uploads/1/3/5/3/135346815/f43a0867cce6f4.pdfIn PDF document text
    • http://dektesheff.xyz/40438927900relvs.pdfIn PDF document text
    • http://goloszauniver.fun/lokatajozjijyh.pdfIn PDF document text
    • https://bepupoxusiboma.weebly.com/uploads/1/3/4/8/134847186/xaregulogam.pdfIn PDF document text
    • http://stakingyfi.com/turaludewugamapugoradafpa66r.pdfIn PDF document text
    • https://powumebaporisav.weebly.com/uploads/1/3/4/8/134891471/1a97071fa.pdfIn PDF document text
    • https://daxeteven.weebly.com/uploads/1/3/2/8/132814811/0af9b269d7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371003/normal_6007f069cadc7.pdfIn PDF document text
    • https://ledunadexaw.weebly.com/uploads/1/3/0/7/130775166/21ae4fb5d13.pdfIn PDF document text
    • https://pogunokele.weebly.com/uploads/1/3/0/7/130739789/rokeb_fewomado_lalifere.pdfIn PDF document text
    • http://mebel-albero.ru/rutatibusardq5bl.pdfIn PDF document text
    • https://nazuvunu.weebly.com/uploads/1/3/4/4/134438845/28bea93009.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_off0000d0d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D8 5360 bytes
SHA-256: 7c1dc41785fcb0517f3a69eecd6a6b4e18b790967cc1c2c132e601dff2c21b98
font_01_sfnt_off0000e32d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32D 10040 bytes
SHA-256: 72bb24b8137b695a596b5d8346622cd1d227ef3020f4e288fada73cd7fd40082

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