Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b4e09b94681dd22…

MALICIOUS

PDF

66.3 KB Created: 2020-12-19 10:44:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: fcc776f29dcd4406b59638cc60d782f5 SHA-1: 177da6a7e88302206255a149e3fdcc53d1d47cd5 SHA-256: 1b4e09b94681dd22f6ffa0ec56dbc3f52f28ddbb813c927171c53bab7586b769
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffset.ru/strik?utm_term=toture+chamber+2 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4457592/normal_5fd5f600ba7b9.pdfIn PDF document text
    • https://rebijigubewu.weebly.com/uploads/1/3/4/7/134770847/zodofegi.pdfIn PDF document text
    • https://foboxujegi.weebly.com/uploads/1/3/4/6/134694162/fadewetisar-vuroduj.pdfIn PDF document text
    • https://fopojikanerev.weebly.com/uploads/1/3/4/8/134888820/wirowetumifitenima.pdfIn PDF document text
    • https://lezotaxodad.weebly.com/uploads/1/3/4/4/134432483/fapok.pdfIn PDF document text
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/rutekonenezosovig.pdfIn PDF document text
    • https://pixamowogiru.weebly.com/uploads/1/3/4/5/134590731/8897913.pdfIn PDF document text
    • https://niritopep.weebly.com/uploads/1/3/4/6/134634222/fupewo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404753/normal_5fd82a4bedfdd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bad87ad-12a3-4fe2-83db-07b011b6f9d1/outward_tips_and_tricks.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7DB 4716 bytes
SHA-256: a6445b70d123a3e99b6d2ed659a7c6bc22809b9e329270e0a06898aad7fefcb8
font_01_sfnt_off0000c868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC868 5048 bytes
SHA-256: 83917499a01a755c87212328850b983b332a55ce8b968a77e3873713d7a82ce0
font_02_sfnt_off0000d96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96A 10360 bytes
SHA-256: 3291af359b33220186670dda412d57e461bdd00b4aba2d649ad132483b3232f0

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