Malicious PDF — malware analysis report

Static analysis result for SHA-256 8963af2019647820…

MALICIOUS

PDF

73.7 KB Created: 2020-12-29 15:44:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 1e4f1e0c15a555af34b46a96030028ac SHA-1: 47e29c9f84b084acc83f328b27d16213d1e6640e SHA-256: 8963af2019647820bda7c3d7f066336392b79bc24f67700c29b70bb79ebeb6e7
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body is heavily obfuscated and unreadable, but the presence of numerous external URIs indicates an attempt to redirect the user to potentially malicious content.

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://trafffi.ru/123?utm_term=d%2526d+5e+dracolich+template PDF link annotation
    • https://cdn.sqhk.co/susiwozobo/iaI6dKO/fezujowimefojapoda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422912/normal_5fa08cd870964.pdfIn PDF document text
    • https://cdn.sqhk.co/xakatikakizi/4hi40N8/business_plan_template_for_clothing_line.pdfIn PDF document text
    • https://kixodebu.weebly.com/uploads/1/3/2/6/132682063/7267019.pdfIn PDF document text
    • https://cdn.sqhk.co/vateviti/chhtHY5/94402871463.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367667/normal_5f916634d3f9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371788/normal_5fbc81f542221.pdfIn PDF document text
    • https://bosijoputa.weebly.com/uploads/1/3/4/3/134317673/pojureserutuxe_zagitasowi_gugulez.pdfIn PDF document text
    • https://vifepupu.weebly.com/uploads/1/3/4/8/134886621/b5dad06cb4ee856.pdfIn PDF document text
    • https://sodefabufu.weebly.com/uploads/1/3/4/4/134473286/kilefebo.pdfIn PDF document text
    • https://lesofetu.weebly.com/uploads/1/3/1/3/131378838/6451069.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/6f40e9e1-c0f2-4650-be19-272f7c7637cd/87996166821.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1aa85271-a3a3-46c8-8156-4115a95226e1/flash_debate_graphic_organizer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed22a955-b9ac-487d-bfbc-3bd26f513f65/liberty_high_school_renton_football_schedule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e50291d5-de4c-4a9c-9c76-28b999d181ce/87540637847.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_off0000e835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE835 4156 bytes
SHA-256: 58eabb24298f18ab3cb5c3f3a5652a185830994b36fd37cd9ad46fcf77495092
font_01_sfnt_off0000f664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF664 10572 bytes
SHA-256: 2bc8c22c0b8fa6a300858b137c718734beccc635e74f2f4c579edf86e6dc3846

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