Malicious PDF — malware analysis report

Static analysis result for SHA-256 c87dea706b382ba6…

MALICIOUS

PDF

72.1 KB Created: 2020-11-25 07:46:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3ff39d636dc47b26ed3c4b87d3416a1d SHA-1: d3a90c66990763b0f16c221f64c266cf4e96f44c SHA-256: c87dea706b382ba63d1efe532ae922b692f4fde11ed45c78c3dd170412a5c041
214 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although the document body is heavily obfuscated, the presence of a malicious URL is a high-confidence indicator of an attack pattern.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cctraff.ru/strik?utm_term=anne+lister+diaries+pdf
    • https://webezajafe.weebly.com/uploads/1/3/4/7/134774073/4282264.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lopadivupudexa/malcolm_x_film_parents_guide.pdf
    • https://s3.amazonaws.com/vexosafugunu/2_the_chemistry_of_life_answer_key.pdf
    • https://s3.amazonaws.com/lixuzo/heathrow_airport_aerodrome_manual.pdf
    • https://uploads.strikinglycdn.com/files/e23e8c2f-2ea1-4ca1-8277-4a2e65f7b483/solution_manual_for_advanced_engineering_mathematics_9th_edition.pdf
    • https://s3.amazonaws.com/vitelitubovuluj/nexuwozavipejunifowuzar.pdf
    • https://uploads.strikinglycdn.com/files/e889a1ad-ae44-423e-af9e-a47b061eaf70/regibigusugogonegeme.pdf
    • https://s3.amazonaws.com/nowokil/plank_junior_high_oswego_il.pdf
    • https://s3.amazonaws.com/fulosobezur/kabufikezemizulikonem.pdf
    • https://uploads.strikinglycdn.com/files/660ceb26-426a-4e6d-b0be-ad9fbd43d99b/mipajavirizexobokasatux.pdf
    • https://uploads.strikinglycdn.com/files/62a9cba4-ffcb-44db-bef8-ecafce94014a/sijubumuzapugaroroju.pdf
    • https://uploads.strikinglycdn.com/files/2e69fcee-5201-4889-91e6-619ca7c201fe/40115877982.pdf
    • https://uploads.strikinglycdn.com/files/f43d6ad5-98ce-4dd0-94d7-9be1f86380d4/mibevexisimu.pdf
    • https://uploads.strikinglycdn.com/files/d20b93c7-5e1e-43f2-83d0-c10c085409ff/42734311493.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_off0000df07.bin
5e8d51dac08acc7030132f223667b6acbc25ccb08a761dccca1a8cfae033c97d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF07 5024 bytes
font_01_sfnt_off0000f027.bin
43cb5ef97eca371fde7122d7efc3a7d32417ead810cbeba7706ed40e92223b77		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF027 10332 bytes

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