Malicious PDF — malware analysis report

Static analysis result for SHA-256 94c3f2521cf998f4…

MALICIOUS

PDF

67.8 KB Created: 2020-12-31 21:01:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 7cd93b2de7c216eab3c2f330d8199ec3 SHA-1: 9da22bfca38d0ead3a702f170b81c6c9de1a6c93 SHA-256: 94c3f2521cf998f4975e6ae3f20fcd03b1b1f6b79de09777b3533938afc6e6d2
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

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://traffine.ru/strik?utm_term=judy+david+w+dr+south+charleston+wv PDF link annotation
    • https://rimosuvifakub.weebly.com/uploads/1/3/4/3/134310068/fd4c6f48237920b.pdfIn PDF document text
    • https://difiraboveju.weebly.com/uploads/1/3/4/5/134508976/nevijemepimab.pdfIn PDF document text
    • https://sivisobimiji.weebly.com/uploads/1/3/4/7/134754783/xupuledubem.pdfIn PDF document text
    • https://jovikuveditowe.weebly.com/uploads/1/3/0/8/130874612/katekalabu-zexebokonoraw-kuvapokagirixob.pdfIn PDF document text
    • https://mefomenixa.weebly.com/uploads/1/3/4/2/134235772/mufapirovadadip.pdfIn PDF document text
    • https://rowopubogapog.weebly.com/uploads/1/3/4/2/134234702/3f4f9549537.pdfIn PDF document text
    • https://zomoxiwoginu.weebly.com/uploads/1/3/1/6/131637743/lugetixori_risoguxo_dizibolivedozo_bojawe.pdfIn PDF document text
    • https://cdn.sqhk.co/kupovite/fSljhhc/flat_pack_kitchen_cabinets_perth.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/e3197dda-e138-46f6-9665-6ed529d85ab1/rig_veda_amavasya_tharpanam_tamil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b82641c-fa00-4a5d-b8fa-b0cbda586bed/better_vampire_lord_transformation_se.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3cbefe4-e937-44ef-8272-c1c55a2e9bd3/lubez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43fb540a-cbfd-43c1-970e-aa0ea826ebf8/lost_wax_method_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/465739f5-b234-4a2c-9e46-6da9d81d3072/19989325541.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/322bfa17-a083-4159-bafb-3b3ea569e87f/65745870499.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ba1ff3d-f456-40d7-8a68-b61a97e57573/70416845560.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_off0000ca68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA68 5272 bytes
SHA-256: 7bb832d64dbb1d51b547f9940c9b0a9cccd816d992944f19647b2273f5772181
font_01_sfnt_off0000dc68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC68 11180 bytes
SHA-256: 56c5b6d6a8f4bde0ada7fb801191291c22b14adb41afe9a3cc58ea663f773064

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