Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4f54bc504d3da31…

MALICIOUS

PDF

71.0 KB Created: 2021-03-05 18:50:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 02ea2c5b196d5244b1cda69e38467b9f SHA-1: 00966a37f7d73108ec35e82bc08759ec07d663af SHA-256: e4f54bc504d3da313f33a5bddc821bc80460fdc6383a5b1f73b8302c4ed28879
244 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to known malicious redirectors or disposable hosting. Heuristics indicate it functions as a link farm, designed to direct users to external sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://dafemum.ru/aws?utm_term=ic+engineering+inc In PDF document text
    • https://cdn-cms.f-static.net/uploads/4481552/normal_60113d8ea8267.pdfIn PDF document text
    • https://gorejirulikem.weebly.com/uploads/1/3/4/7/134738880/5edd7.pdfIn PDF document text
    • http://easylearning.space/tozubewupe6woth.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444104/normal_5fda932ae02ce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428341/normal_5fecfe2ef1312.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373505/normal_602768ae7671b.pdfIn PDF document text
    • https://ruregojuze.weebly.com/uploads/1/3/2/8/132814589/vuzipal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459162/normal_5fd0f032acab5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390681/normal_6016b7a6e1bd5.pdfIn PDF document text
    • https://watagejikifawup.weebly.com/uploads/1/3/4/5/134589749/d6753.pdfIn PDF document text
    • https://mibonujatupogu.weebly.com/uploads/1/3/5/2/135297119/xerenetopanoxadufav.pdfIn PDF document text
    • http://marketeuro.pro/sword_art_online_ps_vita_games_in_orderhgqgx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495037/normal_602a0e85a26d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482623/normal_6025dcfba44eb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/android_master_detail_fragment.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/savudenofagavigotuji.pdfIn PDF document text
    • https://s3.amazonaws.com/sewamos/guitar_family_chords_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/math_worksheets_adding_fractions_like_denominators.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1A 4484 bytes
SHA-256: 7b724862513fc55c8977bc18e7539948be96e2ad774bc9e8f7051d47a72bea81
font_01_sfnt_off0000eb6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6E 10476 bytes
SHA-256: f4dd624839e9feee92c48301cb946da03a4a961557e7b2a9809172c98bcea7fe

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