Malicious PDF — malware analysis report

Static analysis result for SHA-256 8769d2823ea6e22c…

MALICIOUS

PDF

66.8 KB Created: 2020-11-24 06:10:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 43024be76121b0aac055ad98a63d88e0 SHA-1: d340bc3dd19cc4f817c36a32d98672b1ed902bf5 SHA-256: 8769d2823ea6e22cd7e3d2e91556dc450945f24115247546bec7db61cccca098
156 Risk Score

Malware Insights

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

The PDF file contains embedded links, with one prominent URL pointing to a suspicious domain that appears to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

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://trafffe.ru/123?utm_term=how+to+find+the+limiting+reactant+in+a+balanced+equation
    • https://cdn-cms.f-static.net/uploads/4406806/normal_5fa03f34c21ce.pdf
    • https://begaraga.weebly.com/uploads/1/3/4/6/134652864/padifafe.pdf
    • https://cdn-cms.f-static.net/uploads/4403938/normal_5fa3286296af6.pdf
    • https://bojamaluzide.weebly.com/uploads/1/3/4/2/134265872/vorinenol_jofunorejotaj_lexeniwaxetagi.pdf
    • https://cdn-cms.f-static.net/uploads/4370090/normal_5f8ce2a34f2e1.pdf
    • https://cdn-cms.f-static.net/uploads/4529095/normal_5fb3384b55bc4.pdf
    • https://cdn-cms.f-static.net/uploads/4393486/normal_5f995f259e5ed.pdf
    • https://sofakixejiz.weebly.com/uploads/1/3/4/2/134265497/2739887.pdf
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/digodivalupu-farekuwojoro-jowosukifafapon.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3b1c7be2-9182-446f-90e6-f265ef24ce04/pokemon_go_cracked_apk_unlimited_coins.pdf
    • https://uploads.strikinglycdn.com/files/bf7fd88f-18f7-4218-9552-061129bcc06b/rulemiwatetuniz.pdf
    • https://uploads.strikinglycdn.com/files/40c8db8e-3cfd-4113-9e82-15cea93ba036/49109851120.pdf
    • https://uploads.strikinglycdn.com/files/9fe431ea-005f-41c7-820f-004878d5df83/54605048759.pdf
    • https://uploads.strikinglycdn.com/files/6c71b086-6f02-4b19-b5b4-0568bb70a315/biwamuzuwipemomixilejejo.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_off0000c775.bin
8d584b8bb38eb75069b4565bad21f60b62a1bae3c1dd6fc55027e14f1b291496
pdf-font-stream PDF embedded font (sfnt) at offset 0xC775 5576 bytes
font_01_sfnt_off0000da4a.bin
5347351ef692a3dbbe341fcb919fc23d3d93de135bc96b6a0480e9584dbc991b
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4A 10540 bytes