Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5d95741ab38ef46…

MALICIOUS

PDF

79.2 KB Created: 2021-06-13 02:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ff65692fd91bf4dafc60f04ee8f25389 SHA-1: 80b13145b1cfc75b295e46680d62d14f3733643c SHA-256: d5d95741ab38ef4692bac6a5bbdddac0db08298ac16d2004964d01bd632bdf0b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant number pointing to disposable hosting and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a lure to external malicious content, likely involving JavaScript execution within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://medvor.ru/pbw?utm_term=family+feud+late+night+edition+rules
    • https://cdn-cms.f-static.net/uploads/4426279/normal_601708290645c.pdf
    • https://vujoxakot.weebly.com/uploads/1/3/4/3/134318531/dorusu.pdf
    • https://cdn-cms.f-static.net/uploads/4496580/normal_60530b6789c1b.pdf
    • https://zejuraxarobepek.weebly.com/uploads/1/3/1/4/131407797/91492fbcd5.pdf
    • https://cdn-cms.f-static.net/uploads/4488566/normal_6034ce566da2e.pdf
    • https://cdn-cms.f-static.net/uploads/4451374/normal_60c52fbed6d91.pdf
    • https://cdn-cms.f-static.net/uploads/4459466/normal_5fd120b5403e8.pdf
    • https://jegasujarirulif.weebly.com/uploads/1/3/4/7/134720127/6884432.pdf
    • https://fuwodeku.weebly.com/uploads/1/3/6/0/136095673/gofuwokon.pdf
    • https://gifavunebaxagem.weebly.com/uploads/1/3/4/3/134358660/7de038d65fc.pdf
    • https://cdn-cms.f-static.net/uploads/4390081/normal_604bb7c831f7f.pdf
    • https://josubolifixit.weebly.com/uploads/1/3/5/4/135400154/d276f049a780ae.pdf
    • https://zinurutiman.weebly.com/uploads/1/3/5/2/135295757/5784236.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mumasenekera.pbworks.com/f/85327312290.pdf
    • http://lijegazoz.pbworks.com/f/how_to_choose_an_electric_fence_charger.pdf
    • http://pugaxigodaka.pbworks.com/f/33984528025.pdf
    • http://tisowowuduwe.pbworks.com/f/28106939969.pdf
    • http://vesusezipuwe.pbworks.com/w/file/fetch/144809853/norton_anthology_of_world_literature_4th_edition_volume_a.pdf
    • http://tukosifana.pbworks.com/f/navomif.pdf
    • http://masigali.pbworks.com/w/file/fetch/144988095/14033548798.pdf
    • http://vamafob.pbworks.com/f/76098488870.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_off0000f9ad.bin
262966e700d71b3cef54a3c7c2bbe74cc6efba0ffcf03319338a1852c4bbec7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AD 5380 bytes
font_01_sfnt_off00010bd9.bin
11e2d7731dca88446cc8985046082015de45313b6fce6950504207fbafe9eea3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD9 10484 bytes

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