Malicious PDF — malware analysis report

Static analysis result for SHA-256 f405b322d7be8a54…

MALICIOUS

PDF

75.5 KB Created: 2021-04-05 17:03:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 157d452e32acdb14e61cd3f93b3fd5be SHA-1: 932b9e2d61c2bb4675464c2b8bdf7531ccacb55e SHA-256: f405b322d7be8a548743d2e81de56d97d2a2587c93892518b27afbd75f09182e
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and link farms, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains keywords related to the embedded URLs, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/award?keyword=spanish+books+for+beginners+pdf
    • http://jonebukusopovet.mygamesonline.org/nurotedexenu.pdf
    • https://cdn.sqhk.co/wazofelagi/cmT8ghh/8061870463.pdf
    • http://jalazekesofijot.medianewsonline.com/66810193474.pdf
    • https://cdn-cms.f-static.net/uploads/4388163/normal_600e3e2d31167.pdf
    • https://cdn.sqhk.co/mowasikuso/Pnqglgj/wumidasotezabipuvomanagep.pdf
    • http://xexapitanegis.getenjoyment.net/mafukimu.pdf
    • http://zakewabo.scienceontheweb.net/87736822795.pdf
    • http://veselutut.mywebcommunity.org/dunkin_donuts_coffee_with_cream_nutrition.pdf
    • https://static.s123-cdn-static.com/uploads/4484115/normal_6009065daaa7a.pdf
    • https://cdn-cms.f-static.net/uploads/4382614/normal_605f7da63d815.pdf
    • https://cdn.sqhk.co/duxapotor/ibBhajb/wiaa_hockey_playoffs_2020_bracket.pdf
    • http://mujabelor.mywebcommunity.org/biceps_stretches.pdf
    • http://lebojabufi.medianewsonline.com/49885278663.pdf
    • http://nituzovido.getenjoyment.net/reasons_of_stress.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b3dfd9c9-1030-471f-a26d-814ea73dbccc.filesusr.com/ugd/d97afa_ad86c8fd5f57441094c2e2bb73879268.pdf?index=true
    • https://s3.amazonaws.com/xisefowu/46174369680.pdf
    • https://f904ef53-caa1-4f0f-8a97-c50675c03ece.filesusr.com/ugd/2f8cea_7ee6d6f478cf4a88b7948dfdff8c949c.pdf?index=true
    • https://s3.amazonaws.com/wozoxub/gilog.pdf
    • http://jezevenakos.myartsonline.com/81808182784.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_off0000e901.bin
0c47a281cc3f1f67ca54c276ffcd3ed635d50b3530f52043e44cf71cb114e1ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE901 5580 bytes
font_01_sfnt_off0000fbeb.bin
6e85fa960737d175d6a96be202067a71a7c80ec17ddef4d024edf23324455e33		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEB 10848 bytes

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