Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ab79f6d3c014308…

MALICIOUS

PDF

72.7 KB Created: 2021-04-28 21:13:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0594b0f8d1fb56f8af0d3d9db6946baf SHA-1: 72967b7e3be72023e244e4be12c8c72db170ba41 SHA-256: 5ab79f6d3c0143086fe419e56c83752f06f129a589fdc0676dba104b9e3e9959
166 Risk Score

Malware Insights

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

The sample is a PDF file detected as malicious by ClamAV and ML classifiers. It contains multiple external URIs, some of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution attempt. The heuristic 'SE_LOLBIN_RUN_COMMAND' indicates the presence of command-line execution tokens within the document text, further supporting malicious intent. No scripts were extracted, but the overall structure and heuristics point towards a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://midufefew.ru/strik?utm_term=troy+bilt+pony+riding+mower+deck+diagram PDF link annotation
    • http://2022god.com/cmd_to_repair_windows_10_bootyaj5b.pdfIn PDF document text
    • http://beautytopshop.site/dakorukehxsst.pdfIn PDF document text
    • http://lalevuw.mypressonline.com/zamafofip.pdfIn PDF document text
    • https://lukimozogu.weebly.com/uploads/1/3/4/6/134638062/lilugeraju.pdfIn PDF document text
    • https://fibusiwuso.weebly.com/uploads/1/3/4/5/134510481/migevigoworilupefono.pdfIn PDF document text
    • http://mandarins.space/36154864502w8lix.pdfIn PDF document text
    • http://viwavidif.getenjoyment.net/ielts_reading_passages_free_download.pdfIn PDF document text
    • http://kukushpa.fun/python_projects_ideas_githubtoqcm.pdfIn PDF document text
    • https://s3.amazonawsIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dewazewokib/template_cv_adobe_photoshop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c18d432-4a7f-4bfc-bdb0-b9ec81d6995b/periodic_table_worksheet_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/zovasufabide.pdfIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/kaufland_letak_sk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fafe34ee-79b0-4536-a59e-da07c5346a58/where_can_i_find_the_wps_pin_on_my_laptop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ff42289-64db-4299-b5ae-14922d339bb9/39858331267.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_off0000dea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA0 5564 bytes
SHA-256: 23678f9647e9fdb2b270758e755b4a312f4f522dd04934b0cc13cb63c961b657
font_01_sfnt_off0000f192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF192 10748 bytes
SHA-256: 87a13cce00af74910c4a82a67eec100bbc7d7d0cc22c6cc60a53be08b5bfa93d

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