Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2d93029ccbfe950…

MALICIOUS

PDF

65.6 KB Created: 2020-11-10 18:33:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a061118d2922a52fdf8e1d0ad9bb9905 SHA-1: 1e7df25b708ecebc6fd91fd65eff88f7aff45585 SHA-256: a2d93029ccbfe9504569430e8d5eafcd912e37dbc70f4eee111a95e4c2d942af
214 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to external PDF documents, suggesting a link farm or redirection strategy. One critical heuristic identified a link to known malicious redirector infrastructure, indicating a potential phishing or malware distribution attempt. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gettraff.ru/123?keyword=armitron+40+8322+manual
    • https://cdn-cms.f-static.net/uploads/4365576/normal_5f873ffabee49.pdf
    • https://kuvofexe.weebly.com/uploads/1/3/1/1/131163751/zisedobaronux.pdf
    • https://cdn-cms.f-static.net/uploads/4365542/normal_5f8747420149b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/241927f5-1171-452c-8a6a-01ba6dc55c46/freezer_burn_ice_cream_while_pregnant.pdf
    • https://uploads.strikinglycdn.com/files/e28ca107-9144-4958-bf6c-82f1bda1c10c/resident_evil_revelations_bp.pdf
    • https://uploads.strikinglycdn.com/files/d61e451c-a82b-4ff1-b19d-82005816d4c7/amazon_prime_family.pdf
    • https://s3.amazonaws.com/patotale/35765072533.pdf
    • https://uploads.strikinglycdn.com/files/73b0d3a3-e190-452e-9525-23a7fab37e73/78138974396.pdf
    • https://uploads.strikinglycdn.com/files/fe6b7c47-fb57-4952-bfdc-7989e1990d7c/keurig_compact_instruction_manual.pdf
    • https://s3.amazonaws.com/daniwodug/begede.pdf
    • https://uploads.strikinglycdn.com/files/baf9f206-ade4-4c3d-96e5-9c30452f2365/smart_10_balance_wheel_manual.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c270.bin
7a989d1cac8c49781961e14f2cfba8846d66a30dcd80f4ca384c4ef784dce3e9
pdf-font-stream PDF embedded font (sfnt) at offset 0xC270 5360 bytes
font_01_sfnt_off0000d49a.bin
28385f87374c96c8897a7275d28c9059bf4ae14a84c0ee69a5d7c8f7241c3b9e
pdf-font-stream PDF embedded font (sfnt) at offset 0xD49A 10812 bytes