Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e2f2e4414343b5f…

MALICIOUS

PDF

73.6 KB Created: 2020-11-18 12:08:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab6c4193df2a8d1560cfe41c71b39b17 SHA-1: 5812bbdaa64cf02d861335de8d2da02617c1097b SHA-256: 9e2f2e4414343b5f233d0fcbe97f9073adaf47c50a72997fabe5274be7634e4c
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ClamAV detection 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0' strongly indicate a phishing or malware distribution attempt. The presence of numerous external links suggests a link farm or SEO poisoning tactic to obscure the malicious destination.

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-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=problemas+de+aplicacion+de+triangulo
    • https://bekijarodik.weebly.com/uploads/1/3/4/6/134617997/negasezufit.pdf
    • https://tenasusuboziwid.weebly.com/uploads/1/3/4/3/134349012/fidigezaxera.pdf
    • https://cdn-cms.f-static.net/uploads/4367624/normal_5f9b6f62e88a5.pdf
    • https://cdn-cms.f-static.net/uploads/4464996/normal_5fa568782378f.pdf
    • https://zatafepe.weebly.com/uploads/1/3/4/0/134000007/8262813.pdf
    • https://cdn-cms.f-static.net/uploads/4379054/normal_5fa5731af240b.pdf
    • https://gebipobewixaduk.weebly.com/uploads/1/3/4/6/134631326/foxikid.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c09af94e-bc6f-466d-9d0e-0cae52c57679/crane_flow_of_fluids_handbook.pdf
    • https://uploads.strikinglycdn.com/files/8877caa3-7ef8-448b-89c6-64c5c41fa3e9/que_es_la_aurora_boreal_y_donde_se_p.pdf
    • https://uploads.strikinglycdn.com/files/78a03a6e-e0dc-4736-879d-e58fa664a009/56973275086.pdf
    • https://uploads.strikinglycdn.com/files/f778a17f-6dc7-4001-be1f-6881c8810693/73389559124.pdf
    • https://uploads.strikinglycdn.com/files/fbf3146b-c38e-49f2-b9e4-4ac8b4dff74a/22262756848.pdf
    • https://uploads.strikinglycdn.com/files/4b271b47-f2fd-4a4a-93ab-a32d43519d23/63946143945.pdf
    • https://uploads.strikinglycdn.com/files/fe5673a9-2810-4ed9-a110-2aa98e4a4f7c/98193842550.pdf
    • https://uploads.strikinglycdn.com/files/f455fb6d-8448-4c05-934a-cc78f9430de2/classic_8_conference_football_standings.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_off0000e08f.bin
f2fc2eda6652b9f2d95323c1fbf1145ba8f7cec3d8b321cafa8e37b46862b8e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE08F 5536 bytes
font_01_sfnt_off0000f33c.bin
632508a04b04e38181977778f1d6d1e8037f5ba18849e17174b4523cd122fc1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF33C 11156 bytes

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