Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4cbd1def1f6d60c…

MALICIOUS

PDF

79.1 KB Created: 2021-03-18 11:30:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 42447046a49f3b0899fde40a0c4a575f SHA-1: 79b8148bcc0bfa819efe6b454a4bae781928f74c SHA-256: c4cbd1def1f6d60c181ca8378db5ce697c102eac9e462c4547e10a275787796f
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were extracted, the structure and URL patterns are consistent with malicious PDFs designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://vilenefex.ru/strik?utm_term=bearcat+880+rf+out+fail
    • https://static.s123-cdn-static.com/uploads/4390638/normal_60064437d8c31.pdf
    • https://cdn-cms.f-static.net/uploads/4388835/normal_6023d495eed06.pdf
    • https://sevokubataper.weebly.com/uploads/1/3/0/8/130814346/nifewowikemoxode.pdf
    • https://wuduzavuvavazi.weebly.com/uploads/1/3/4/6/134618101/a8e547246fc41c.pdf
    • https://static.s123-cdn-static.com/uploads/4499309/normal_600360938cab5.pdf
    • https://kutemipemowu.weebly.com/uploads/1/3/4/8/134860595/eefa6177f.pdf
    • https://debuvubuni.weebly.com/uploads/1/3/4/8/134846467/ece283a044b8b.pdf
    • https://retibome.weebly.com/uploads/1/3/4/6/134680472/2818463.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://83d12552-0bc1-4415-b221-1da25caacb9b.filesusr.com/ugd/1e11d0_e8ad8a1f48e14efd8f3b527739d63835.pdf?index=true
    • https://s3.amazonaws.com/legenapi/wowepasunisumobus.pdf
    • http://tufuripisaren.epizy.com/centimeters_meters_kilometers_worksheet.pdf
    • https://8641c524-1fb5-4292-87ed-dd72f64d6c22.filesusr.com/ugd/9b7d8a_fa1a8376842e409998abb4a51e730cd0.pdf?index=true
    • https://4be8a7ba-6c9a-47a4-99fc-a5961b41a404.filesusr.com/ugd/132250_bc5eb90929f24d969f2eca477b9b168e.pdf?index=true
    • https://s3.amazonaws.com/mejigavukolu/buxaganemaxoko.pdf
    • http://rufuregebedus.rf.gd/63789003393.pdf
    • http://zezevefo.rf.gd/bomba_de_engranajes_externos.pdf
    • https://47c0d0ed-94e3-447f-940a-e265262d053f.filesusr.com/ugd/a43ec6_77237b2dc5a1494984ff5fa47bd51607.pdf?index=true
    • https://uploads.strikinglycdn.com/files/587c8536-9adc-4839-8ceb-b8e4639d0bee/93435413304.pdf
    • https://uploads.strikinglycdn.com/files/d8344446-caa9-4914-b959-9ebd655fe990/parallette_bar_routine.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_off0000f66b.bin
6a9982ea85cc48d680ea9d8149ae2fa534840e0e16e1b16171e99fb9d19f4092		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF66B 5080 bytes
font_01_sfnt_off000107bf.bin
b87b7950fb636759f67fff982a4740e5b5b9959a13be76c6f7e45aa5cd4dc164		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107BF 11228 bytes

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