Malicious PDF — malware analysis report

Static analysis result for SHA-256 90bbca6eea1327f8…

MALICIOUS

PDF

67.2 KB Created: 2020-12-14 15:01:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebbff139943469d54efd626498410480 SHA-1: 7a734e4bf4e0ccd02113542eb393dd1716e78b0e SHA-256: 90bbca6eea1327f8d0e351b0ce968e9f3852ef4d467cc6426813fb4c1f3fe747
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, a technique often used for SEO poisoning or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The primary malicious URL identified is trafffe.ru.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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
  • 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://trafffe.ru/strik?utm_term=how+to+make+a+toga+out+of+bed+sheets
    • https://cdn-cms.f-static.net/uploads/4427313/normal_5f9f81731e345.pdf
    • https://nogafuku.weebly.com/uploads/1/3/2/8/132815296/7596933.pdf
    • https://cdn-cms.f-static.net/uploads/4370265/normal_5fad46de6d0b5.pdf
    • https://sozusodugalonus.weebly.com/uploads/1/3/4/6/134614171/venikoxubosaku.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tokit/sametoweb.pdf
    • https://s3.amazonaws.com/senodiw/latezizurokeju.pdf
    • https://s3.amazonaws.com/sukedil/simple_gear_train_with_idler_vex.pdf
    • https://uploads.strikinglycdn.com/files/a545de5e-cb1c-4363-a204-884ac0890602/xuturobamop.pdf
    • https://s3.amazonaws.com/lojigevaxive/bob_minor_net_worth.pdf
    • https://static1.squarespace.com/static/5fc1520988c99b6d37aa082c/t/5fca8eb9222353306a91c001/1607110329703/what_started_the_civil_war_in_russia.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_off0000c96a.bin
42c64d543fb6bdac51169ac2793331f19410a4c998f4587d31b22f61feea6847		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC96A 5452 bytes
font_01_sfnt_off0000dbe1.bin
f58abb53e318081fcc32d06e779ff92c68cdaa606b78cd6944dc81a95b68b6e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE1 10600 bytes

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