Malicious PDF — malware analysis report

Static analysis result for SHA-256 26074dda9cd59666…

MALICIOUS

PDF

81.3 KB Created: 2021-01-20 05:28:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 5ddbfd83265b472ce936b766ec13c7c7 SHA-1: 7785e24ce577dd819b3db85f15674cb0664a7a1a SHA-256: 26074dda9cd596669692795bbec9d66488cff1be412c3aac7833bdb2169f05f6
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. ClamAV and ML classifiers identified this as a phishing or malicious PDF. The presence of numerous external links suggests an attempt to lead users to malicious content or phishing sites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/123?utm_term=there+for+tomorrow+lyrics PDF link annotation
    • https://site-1197381.mozfiles.com/files/1197381/tarizenoxa.pdfIn PDF document text
    • https://dowizipolejufu.weebly.com/uploads/1/3/0/7/130775784/6e25c03fb6751.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385847/normal_5fece8947e055.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406166/normal_5fc92ee089cf6.pdfIn PDF document text
    • https://javimitama.weebly.com/uploads/1/3/4/3/134349319/lamoxebukoruz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447280/normal_5fe9517bda9d3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476750/normal_5fcee526f0bac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409257/normal_5fa20c3334c7d.pdfIn PDF document text
    • https://site-1176492.mozfiles.com/files/1176492/marketing_communication_plan_timeline_template.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385021/normal_5f9ae679ae537.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476152/normal_5fada2e545812.pdfIn PDF document text
    • https://site-1179801.mozfiles.com/files/1179801/62304187305.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412897/normal_5fa255278f565.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379969/normal_5fdc18cc24825.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/gonima/apc_smart_ups_sc_1000_service_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/zogexofudenawimiditenigat.pdfIn PDF document text
    • https://s3.amazonaws.com/kokesatodixon/st_bedes_blackburn_uniform.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_off000102bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BD 5052 bytes
SHA-256: 1aebd40fff002c502448299616a20293a9f529d24cfd3ce64548aed67a691795
font_01_sfnt_off000113e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E2 10736 bytes
SHA-256: 0a428ee4d588d4c87ffeb22db2ed08a35557b3cb92364b86af84f9a361a04c3c

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