Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bf2424ee1ee1acd…

MALICIOUS

PDF

84.6 KB Created: 2021-02-25 08:29:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: b2504f4e34ae319ef406fc48d5e377d1 SHA-1: 4413b4ff06f542570255855dc00e5c6f46b0bbce SHA-256: 9bf2424ee1ee1acd104b02d91c1e30d0bcd40833ce4a02866122cac821a957e9
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting services, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure disguised as a search result, directing users to external malicious sites like https://baarspo.ru/strik. This suggests the PDF is used to redirect users to phishing or malware download pages.

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://baarspo.ru/strik?utm_term=where+is+the+power+steering+fluid+on+a+2003+honda+odyssey PDF link annotation
    • https://tupodoki.weebly.com/uploads/1/3/0/7/130776149/0946b0.pdfIn PDF document text
    • https://cdn.sqhk.co/zesonixiv/hiM8S1C/recette_sandwich_mou.pdfIn PDF document text
    • https://cdn.sqhk.co/pugirunosamo/ie3jgGO/danojenivof.pdfIn PDF document text
    • https://xatevixi.weebly.com/uploads/1/3/4/6/134651360/rinujibimuridijak.pdfIn PDF document text
    • http://famozosivupiwij.sportsontheweb.net/rurenomokukavaxokel.pdfIn PDF document text
    • https://tazidafojunuxu.weebly.com/uploads/1/3/3/9/133997245/2502243.pdfIn PDF document text
    • http://leduxebawini.22web.org/personal_leadership_philosophy_template.pdfIn PDF document text
    • http://fawikenaxalu.scienceontheweb.net/bodybuilding_food_nutrition_chart.pdfIn PDF document text
    • https://cdn.sqhk.co/fasotaluvose/U0Ggfgi/bomasupozugibutevopiketol.pdfIn PDF document text
    • https://famonusowofem.weebly.com/uploads/1/3/4/3/134349488/1973683.pdfIn PDF document text
    • http://kunabote.22web.org/12548263179.pdfIn PDF document text
    • https://taburexil.weebly.com/uploads/1/3/4/3/134374137/5443206.pdfIn PDF document text
    • http://futegejetebe.22web.org/vuvirasuvumaporamuta.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tejizikadojuni.epizy.com/85262134457.pdfIn PDF document text
    • http://bumezemenunaxiv.epizy.com/11023250072.pdfIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/78494467834.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_off00010d4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4C 5948 bytes
SHA-256: 5a986b74dbb0fe640923d5dd659fd8c34320cd89b1d4068abdfea3377bdf1b33
font_01_sfnt_off000121a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A9 10352 bytes
SHA-256: e98ac0afc76e0e42265a25158ddc80f857c07c3b498327796a27dca3f9c080f6

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