Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f9440e6ea246d89…

MALICIOUS

PDF

87.4 KB Created: 2020-12-27 09:55:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c7908d17f9abd8cedb124375e23fdda SHA-1: 7db7baece7b55c84a942632a684c2490877973e0 SHA-256: 3f9440e6ea246d8943f90944d711a60e824ca57b7f7e012591847f239bdbd36f
214 Risk Score

Malware Insights

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

This PDF file contains multiple embedded links, with one specifically identified as a malicious redirector. The heuristic firings indicate the document is designed to link to external, potentially malicious, content, and ClamAV detected it as a phishing trojan. While no scripts were directly extracted, the presence of numerous links suggests an attempt to redirect the user to malicious websites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=cable+size+chart+according+to+load
    • https://gabejopow.weebly.com/uploads/1/3/4/5/134597712/8163ca3b.pdf
    • https://xepajozojiv.weebly.com/uploads/1/3/4/4/134476610/a7ebd6f110a3.pdf
    • https://cdn.sqhk.co/gujadozede/eoZhhih/drop_stack_ball_game_download_softonic.pdf
    • https://zarimuxeve.weebly.com/uploads/1/3/4/8/134897304/37d78e.pdf
    • https://cdn.sqhk.co/pofifarim/gfhfih1/godamasariderap.pdf
    • https://linepofikoleku.weebly.com/uploads/1/3/4/4/134492010/fe568d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5e069be7-ee92-4918-b083-7eb41966f2f6/33787589286.pdf
    • https://uploads.strikinglycdn.com/files/d577356c-1269-46bc-bcb7-fa88ac5535c4/kovizopezukul.pdf
    • https://s3.amazonaws.com/jowutoneranemuk/63465765728.pdf
    • https://s3.amazonaws.com/zepifudoxapo/zafibebexin.pdf
    • https://s3.amazonaws.com/pibajuwi/american_history_1_final_exam_review.pdf
    • https://s3.amazonaws.com/najipavez/neluw.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_off00011726.bin
257515e9fb23b2650ad08794bf1bf80afee774aa560d3563dbc1a552c4073e4b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11726 5296 bytes
font_01_sfnt_off0001291f.bin
5a0950397946f96d5e5e1488d6212986850f1f1135ecd8d094bf744d3c09c39c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1291F 11692 bytes