Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d4c747ba1163e08…

MALICIOUS

PDF

66.5 KB Created: 2020-12-22 21:40:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5794b97d14d5915d78545d9ea5cac5a7 SHA-1: 17d8c73b2b557a0244cfc2125043d4042b363b33 SHA-256: 6d4c747ba1163e08d751d1fa46fa9d4c10c2f8b6aa0c9e6e9eb0e19d48a5e865
214 Risk Score

Malware Insights

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

This PDF file contains numerous links to external websites, a common tactic for SEO link farms and phishing. The primary malicious link directs users to a redirector, likely to obscure the final destination of the attack. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

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=cake+decorating+classes+michaels
    • https://jowamevo.weebly.com/uploads/1/3/4/5/134511132/9804449.pdf
    • https://pevigegokepos.weebly.com/uploads/1/3/4/3/134366184/6707085.pdf
    • https://cdn-cms.f-static.net/uploads/4403819/normal_5faf4c6e974f3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e256c3a9-b680-4f3c-b3a7-d4b75cef6b27/rajurenuwazaru.pdf
    • https://uploads.strikinglycdn.com/files/a517bf5f-aa99-434b-9cd2-d7b8d743d86a/dumebisabuzetutop.pdf
    • https://s3.amazonaws.com/sojaxub/incursion_league_challenges_analysis_newbie_guide.pdf
    • https://uploads.strikinglycdn.com/files/fefcd6a5-6f26-41b3-b044-bfbe5a278de1/danganronpa_1_characters_sprites.pdf
    • https://s3.amazonaws.com/jamuluvuvava/robert_forster_actor_bio.pdf
    • https://s3.amazonaws.com/nowonovege/wavavujozisumuregupo.pdf
    • https://uploads.strikinglycdn.com/files/78004d51-d8e7-4b42-bf4f-f1796b1c05ea/ranufalowufe.pdf
    • https://s3.amazonaws.com/nerugiraxura/how_to_make_fake_blood_cancer_report.pdf
    • https://s3.amazonaws.com/tixedujegibex/bigeki.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_off0000c749.bin
d46156242df6f9549e98718edaf73b2eaf29d8745607100a25dff6bd1968ee9d
pdf-font-stream PDF embedded font (sfnt) at offset 0xC749 5320 bytes
font_01_sfnt_off0000d932.bin
77b27be8ef327916a7280d7be13cdb570a002da7a735f408fc4607ff8c872c4f
pdf-font-stream PDF embedded font (sfnt) at offset 0xD932 9980 bytes