Malicious PDF — malware analysis report

Static analysis result for SHA-256 6934b16c9c721abc…

MALICIOUS

PDF

66.2 KB Created: 2020-12-10 05:42:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba76cad21932d71403028a71daacbc85 SHA-1: 5e3ccc2234676efbdfadc6f3b2fcbd93192b23f9 SHA-256: 6934b16c9c721abc754fea4ce6e95200ed438437c6fd99d9bd3d7d1302535d5e
252 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file contains a large number of embedded links, many pointing to disposable hosting and redirector services, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely involving the exploitation of PDF vulnerabilities to execute further payloads, possibly via JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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-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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gettraff.ru/strik?utm_term=spanish+question+words+posters
    • https://jojusilinu.weebly.com/uploads/1/3/4/3/134343509/wanoluk_tabulat_suzuteb.pdf
    • https://vujanakisa.weebly.com/uploads/1/3/4/4/134401771/04acef2783c8.pdf
    • https://jodejivosarixu.weebly.com/uploads/1/3/4/3/134314211/fa1186197fc.pdf
    • https://suvewuvasalu.weebly.com/uploads/1/3/4/7/134762181/3151902.pdf
    • https://kalodutizifurul.weebly.com/uploads/1/3/4/5/134597908/sogatosamezafa.pdf
    • https://sakukavazu.weebly.com/uploads/1/3/1/3/131379729/cfae5604d87.pdf
    • https://cdn-cms.f-static.net/uploads/4408719/normal_5fa090bbef529.pdf
    • https://cdn-cms.f-static.net/uploads/4377936/normal_5f9422beeb15c.pdf
    • https://zavisedifigi.weebly.com/uploads/1/3/4/3/134316550/53a7e4bb765e.pdf
    • https://cdn-cms.f-static.net/uploads/4366308/normal_5fa32c6592007.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/padoragog/kendo_ui_grid_pager_template.pdf
    • https://s3.amazonaws.com/fajixe/nordictrack_cx_938_elliptical_parts.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_off0000c497.bin
d710666709d6f74bfae28a33da78e2a6ab55277f08bf8faded4844596a567902		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC497 5336 bytes
font_01_sfnt_off0000d6c7.bin
ea6e0bda641272b8440bbc24a7a074433635976d379503b4c6efe57c70fd7a47		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C7 11520 bytes

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