Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7f00aa2aee0674b…

MALICIOUS

PDF

77.6 KB Created: 2020-12-17 06:13:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: e56c1018e757a5fce11cd8ce8546dda9 SHA-1: 73606d8773159dee57d9505552c9a0accae37359 SHA-256: b7f00aa2aee0674b630bd0dbe133a5ba32c1241b24d2f8b76567e38555c90f77
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. The heuristic 'PDF_SEO_LINK_FARM' indicates the presence of numerous external PDF links, with one prominent URL pointing to 'trafffi.ru'. While no scripts were directly extracted, the nature of the link farm suggests an attempt to redirect users to potentially malicious sites or to manipulate search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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=inquisitive+5e+build PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4377113/normal_5fd344b18c603.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446019/normal_5fb986be5b2e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386092/normal_5fc0209da9d02.pdfIn PDF document text
    • https://xitonodulamet.weebly.com/uploads/1/3/4/3/134307836/rirezu_mamopetofono_gubelisobojanij_juxuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495681/normal_5fd200fa2fbaa.pdfIn PDF document text
    • https://kasalaketowo.weebly.com/uploads/1/3/4/8/134871290/b4dc24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374518/normal_5fc0cd601e9fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465012/normal_5fd33beec58f1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc4e0fba5bc066edfbf0e5c/t/5fc800656ac9cb6dc34fb3f3/1606942831749/arenado_baseball_club.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e60b24b06a7eb3ff207b/t/5fc1b0e21972c46e3cde027e/1606529250707/59635968895.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce9b08c70c0163892578ce/t/5fd223417c12252903fc964b/1607607105491/epic_games_free_games_list_leak_2020.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1d3b3f9866f3fd2dadad4/t/5fc9f39b9bc93d20d9b26130/1607070619674/chocolate_cake_recipe_minecraft.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_off0000f42f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42F 4900 bytes
SHA-256: da45e36509d271eac5c08c7ef210bb3c7017184621e58eff4ea81fbb3ec11d64
font_01_sfnt_off000104f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F8 11084 bytes
SHA-256: 0d803c7bf040ef13aaa44249b457c8bb090c3fbf6dec70a157cb2e5e13c3da6e

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