Malicious PDF — malware analysis report

Static analysis result for SHA-256 50fa2661b9854936…

MALICIOUS

PDF

69.9 KB Created: 2021-04-08 16:59:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4e90e62e71acc259479f0b973efcc908 SHA-1: df5f17e9b3cb1385fa5b2bb198213e97d654643b SHA-256: 50fa2661b98549363865aa9d8ff0ffdfc28abba72bc6fb596a55e72f2020a512
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML and ClamAV as malicious, exhibiting characteristics of a phishing attempt. It contains numerous embedded URLs, with a primary suspicious URL pointing to a domain associated with malware distribution. The document body, though partially corrupted, suggests a lure related to a 'Troy bilt super bronco 46 manual'. No scripts were extracted, but the presence of multiple external URIs and the link farm heuristic indicate an attempt to redirect users to malicious content.

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://kuzutuzo.ru/strik?utm_term=troy+bilt+super+bronco+46+manual PDF link annotation
    • http://sujabupinoda.scienceontheweb.net/visaputejumis.pdfIn PDF document text
    • http://siteznakomstv69.space/282140812431ai32.pdfIn PDF document text
    • http://pegejoruvufiron.sportsontheweb.net/35206774290.pdfIn PDF document text
    • http://medebupima.sportsontheweb.net/80430122735.pdfIn PDF document text
    • http://fibutogu.mywebcommunity.org/37168088951.pdfIn PDF document text
    • http://nesobaka9.xyz/baxuxanivelusi9fjem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402289/normal_60450975e35be.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453718/normal_5fe167816318f.pdfIn PDF document text
    • http://xolimaked.iblogger.org/gabudarer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2ac8321c-28d8-41c8-ac7a-99137a6fe030.filesusr.com/ugd/157ee0_d5cd67b7e85247abbec682e9b80ddaf7.pdf?index=trueIn PDF document text
    • http://mekepeputidiji.epizy.com/discrete_and_combinatorial_mathematics_an_applied_introduction_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f79628ff-55ed-40cc-9262-a1fa514dc2e2/the_way_of_the_peaceful_warrior_dan_millman.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96c9e174-9d00-454f-93ff-2cd4a4058c9e/gitufabadobimisale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d4d6237-0432-4abd-b73b-3c6e195570da/bepinujaxafovu.pdfIn PDF document text
    • https://d3df31c7-72fe-42b1-a92e-0723e8ed7a16.filesusr.com/ugd/5bf82b_5daac04268b74db9aa913775bb70dee8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1df9ae2b-4896-4932-b975-2e3d278f7557/24115577156.pdfIn PDF document text
    • http://gesuposobevexo.rf.gd/cdf_and_in_probability.pdfIn PDF document text
    • http://telosizaba.onlinewebshop.net/kuvuwileni.pdfIn PDF document text
    • https://41fe7446-7195-45c8-906d-de5e784989f9.filesusr.com/ugd/e02969_5c7771ed4ada461793e3d4c6eea53165.pdf?index=trueIn 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_off0000d0fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0FC 5512 bytes
SHA-256: 35976377e645430d32636d9c66c2e5957ae5ac9f27beacf0c94f80bbeef42236
font_01_sfnt_off0000e3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AC 10944 bytes
SHA-256: ef2b12b37f1c726083035aee5f2e39189ecc315f7a5abd06e2d04221a3b46fc2

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