Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab5957908a250d02…

MALICIOUS

PDF

78.9 KB Created: 2021-03-03 07:30:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 77f1dae450a29b1dfd981e251388f591 SHA-1: 39f35a03653d186d5d0d61dcc5030bd123ad454d SHA-256: ab5957908a250d0297a01c4f92e78872c8c6be65419291beaa5d1c18c18135e5
166 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'powershell_v1.0_virus.pdf', suggesting an attempt to disguise malicious content or execute commands. Numerous external URLs were extracted, many pointing to disposable hosting and link farms, indicating a likely phishing or malware distribution scheme. The presence of 'powershell_v1.0_virus.pdf' in the document text, combined with the PDF_URI heuristic, strongly suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/strik?utm_term=the+world+until+yesterday+what+can+we+learn+from+traditional+societies+by+jared+diamond PDF link annotation
    • https://cdn.sqhk.co/bevoroxur/KMejesQ/3234067202.pdfIn PDF document text
    • http://zagavogafewakud.iblogger.org/huck_finn_chapter_18_summary_shmoop.pdfIn PDF document text
    • http://lezigovedavide.getenjoyment.net/probabilidad_estadstica_en_ingls.pdfIn PDF document text
    • http://lelekelosutov.getenjoyment.net/33083140939.pdfIn PDF document text
    • http://gukiduwonaxinef.getenjoyment.net/sharepoint_2013_workflow_not_starting_when_item_is_created.pdfIn PDF document text
    • https://cdn.sqhk.co/zugeketinog/Lcgj6gf/34802230722.pdfIn macro / runtime command snippet
    • http://katipef.medianewsonline.com/33751426198.pdfIn PDF document text
    • http://gukivuzijisuva.getenjoyment.net/84792396870.pdfIn PDF document text
    • http://copyright-services-us.com/jidekidegixijofabinalcvf7q.pdfIn PDF document text
    • https://cdn.sqhk.co/bulixanejad/1hgiaij/dijezoliwobopadiwudonos.pdfIn PDF document text
    • http://gukiduwonaxinef.getenjoymenIn 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/suzixegazunow/ragnarok_mobile_m_eternal_love_leveling_guide.pdfIn PDF document text
    • http://jisijuvod.myartsonline.com/windows_powershell_v1.0_virus.pdfIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/ura_master_plan_2014.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_off0000f5cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CD 5620 bytes
SHA-256: 130db204c3861c58e0e6569e782172fda13b0bd0e64796edf0125b4b13fc0d3c
font_01_sfnt_off000108d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D3 10668 bytes
SHA-256: 26e4c7f62312555ffda095651c417677bddbc1fe1cc2d19b51059e118c3185c2

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