Malicious PDF — malware analysis report

Static analysis result for SHA-256 97cdd0cb005cf22f…

MALICIOUS

PDF

71.7 KB Created: 2020-12-22 08:11:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: f4c1b08cb70c603d65466026d9e9310d SHA-1: 85a33c95a543db4c8e48281f78077722dbbec3cc SHA-256: 97cdd0cb005cf22f40c6cb921e112db73a57e502d7e1a9b8b621dd012cee91f9
244 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, with several pointing to known malicious redirector infrastructure. The presence of a link farm and disposable hosting suggests an attempt to manipulate search engine results or direct users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, indicating it is likely a phishing or redirection tool.

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
  • 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://cctraff.ru/123?utm_term=tera+ninja+pve+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4387810/normal_5fb9fae8b9e05.pdfIn PDF document text
    • https://zorusijumabek.weebly.com/uploads/1/3/4/8/134851431/zugedoxi_zevujubowawuri_taluvamuduzum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480898/normal_5fac20c262a8f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413363/normal_5fc5aabd6d7a2.pdfIn PDF document text
    • https://pumutetigowon.weebly.com/uploads/1/3/4/6/134699291/xijaxumir-benifoku.pdfIn PDF document text
    • https://miniroworopan.weebly.com/uploads/1/3/4/4/134444940/lewarala_laxalowugubo_zexokogewamot_lemom.pdfIn PDF document text
    • https://poriveba.weebly.com/uploads/1/3/4/3/134316211/64193cfab.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/d3923691-0595-48f9-9166-8c4e9106552f/bowiganelilomidow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4935b127-5259-475b-b5dc-0b3dcb87b63d/80575114876.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f9aaa1d-c906-4195-ac74-0633fdb2736b/91457996063.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf5947e6d49a06bb89177d/1606375752318/89979192670.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d38e3784-f78e-44c3-85f1-59fd4f0e15ab/beautiful_tome_5_ekladata.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce5d9dba-1675-4407-af7c-3964cb75641a/begejej.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbfd2c30b6b03258f2f7c3b/t/5fc32a719b1ed035384469be/1606625906510/31134291593.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dead480d-18e4-47c6-af6f-660c87c17021/nanda_nursing_diagnosis_for_risk_for_dvt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78304bf1-96f3-412c-9c09-755eb6c55d12/how_to_soak_off_fake_gel_nails_at_home.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_off0000dda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA4 5000 bytes
SHA-256: 5a8f9e79c3371c62e203609fed85077f78bcca13cd4019f6619f546674039215
font_01_sfnt_off0000eec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC5 10332 bytes
SHA-256: 8853d1b4d505a6833f24e623697d1478bd17788312dc01c53ee08c2f29e6da30