Malicious PDF — malware analysis report

Static analysis result for SHA-256 14a4d228c787f5ff…

MALICIOUS

PDF

91.7 KB Created: 2020-12-28 00:35:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c375bf6130fa86dc00c4bb6c2b4da499 SHA-1: 1d8af4568f58c5e2e7862f46640d2625645a6c94 SHA-256: 14a4d228c787f5ff4f28d79345b4b3451eea3a6b7b72c5a8efacac567b14d535
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a phishing or malware distribution attempt. It contains a large number of external links, suggesting it functions as a link farm to direct users to potentially harmful websites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafficel.ru/123?utm_term=ontario+provincial+police+association
    • https://cdn.sqhk.co/fofasafiwi/gMbiThb/sonny_s_bbq_near_me_menu.pdf
    • https://vamekatowozi.weebly.com/uploads/1/3/0/8/130814347/039dd.pdf
    • https://sagolofuba.weebly.com/uploads/1/3/4/8/134873879/424433f6948d86.pdf
    • https://static.s123-cdn-static.com/uploads/4369308/normal_5fe54e6772747.pdf
    • https://futokiwusilo.weebly.com/uploads/1/3/4/4/134458686/1208680.pdf
    • https://pafasuletelaw.weebly.com/uploads/1/3/4/4/134447528/3d4c77a818b6734.pdf
    • https://vazitaxigenot.weebly.com/uploads/1/3/4/6/134640409/8527513.pdf
    • https://cdn.sqhk.co/nuxowilag/jjjdA0G/13763883575.pdf
    • https://cdn.sqhk.co/potasuregoz/UjewTLf/14204918818.pdf
    • https://cdn.sqhk.co/dofewijoras/gshjhO7/fafikufufasuka.pdf
    • https://cdn-cms.f-static.net/uploads/4404116/normal_5fa4e4db9470d.pdf
    • https://cdn.sqhk.co/kevejonob/haPgjiO/vowudezi.pdf
    • https://cdn.sqhk.co/tavikagisato/jfPhggh/endless_falling_game_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off00012a1d.bin
f0c71cf09f0ca41bf70e7cd77828b834d68be9bc7a6c83bb010f6544db48fae0
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A1D 5012 bytes
font_01_sfnt_off00013b3b.bin
e109285d926ccc2e68a8f640f5b6ce37ed35000d0fefeda3559a3168c2b6a7e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B3B 11612 bytes