Malicious PDF — malware analysis report

Static analysis result for SHA-256 43aeddff49231800…

MALICIOUS

PDF

71.5 KB Created: 2020-12-24 11:44:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa2958baaafc3b2a723b54cd83a284c7 SHA-1: 7f16d1196bbb65b2a636109cde4b664270d10dcf SHA-256: 43aeddff49231800e1f1e7afba819a53a735f1e1e0cc48925a4ee74baec097e4
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting services, and one critical heuristic identified it as a redirector link to known malicious infrastructure. The ML classifier and ClamAV also flagged this PDF as malicious, indicating a phishing or scam attempt. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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=crowdsourcing+websites+list
    • https://wadonado.weebly.com/uploads/1/3/4/6/134677460/lujogifafi.pdf
    • https://cdn-cms.f-static.net/uploads/4366982/normal_5f8fa1ace0ebf.pdf
    • https://sewuvemap.weebly.com/uploads/1/3/4/3/134377394/d60d9.pdf
    • https://wimolakerozer.weebly.com/uploads/1/3/4/4/134448160/mubuzuv_zexedinera.pdf
    • https://cdn.sqhk.co/nosuterib/c0hheic/banco_do_brasil_santos_dumont_telefone.pdf
    • https://wajigigo.weebly.com/uploads/1/3/4/5/134588105/nivoxowamadol.pdf
    • https://votawaxamudogop.weebly.com/uploads/1/3/4/4/134400347/duliporej.pdf
    • https://kepevexin.weebly.com/uploads/1/3/4/2/134234606/lovol_wazijobunujejex_pubuvajokuro.pdf
    • https://cdn.sqhk.co/fumazuri/b1jjNJE/usa_today_logo_case_study.pdf
    • https://cdn.sqhk.co/xolizoxime/1J7Ghix/freedoom_app_github.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/banula/82372486947.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc45.bin
4af6e2be92e3dfcea9ac2c5367e7c5c4d82ba82622813fdd069f6a98595f4dbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC45 5032 bytes
font_01_sfnt_off0000dd81.bin
46744826061579bd57e41f595eb2273d4af989a7b1069c34aa8b9d88a6e4c231		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD81 11020 bytes
font_02_sfnt_off000102ff.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102FF 4324 bytes

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