Malicious PDF — malware analysis report

Static analysis result for SHA-256 2335397101f0517f…

MALICIOUS

PDF

95.9 KB Created: 2020-12-26 07:39:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 92bdf0045ebcefc6a5e1cdd3e347d054 SHA-1: d71c70a70117f01448afc99964057bbc18957951 SHA-256: 2335397101f0517f4573fbbdea3ae86f7f61dfaaf9c4639167c6909effcae630
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, with several pointing to known redirector infrastructure and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam campaigns. No scripts were extracted, and the document body is heavily obfuscated, preventing a more detailed analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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.
  • 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://traffmen.ru/123?utm_term=what+is+the+climate+in+europe In PDF document text
    • https://delutezebojuk.weebly.com/uploads/1/3/4/3/134353455/687174.pdfIn PDF document text
    • https://pepotoxuxomupav.weebly.com/uploads/1/3/1/4/131483830/xejoxiz.pdfIn PDF document text
    • https://dokoxinizim.weebly.com/uploads/1/3/4/3/134305801/sirijeguzo.pdfIn PDF document text
    • https://mowasevibipogo.weebly.com/uploads/1/3/1/3/131379904/dulubazimev.pdfIn PDF document text
    • https://gojudewusidaza.weebly.com/uploads/1/3/4/8/134888042/gokunizigixeboxi.pdfIn PDF document text
    • https://cdn.sqhk.co/dizirajeb/bgjihgB/incivility_in_the_workplace_ted_talk.pdfIn PDF document text
    • https://juvuxoxeziw.weebly.com/uploads/1/3/4/3/134313380/mefuwiminopewal.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/422057aa-2084-46d0-a84f-163ec8e7b551/55201422487.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e106056-d8e3-4fac-8712-fad391a03875/the_adventure_zone_wikipedia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1773ccb-1fa5-497e-a977-7a4a133cb5f3/manual_high_school_peoria_il.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d216ce80-1f94-47f3-9ca7-8c1df152be03/verabaza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df91e92a-f371-4ef6-8b75-ec0156a72dfe/88211071158.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aafab8bf-9c11-42ca-921b-f4c4bdcd13f3/32099077731.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_off00013998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13998 5188 bytes
SHA-256: 8b69d7168f6709319cf8ca247e36be3904840c7f889d542daa583f3c7762e569
font_01_sfnt_off00014b1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B1A 12084 bytes
SHA-256: d778a949319f1dfb4ee0a6ec962a0ad7969f17cc4a17f212a2b5ca69c184d18e

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