Malicious PDF — malware analysis report

Static analysis result for SHA-256 da06b41873c33ad0…

MALICIOUS

PDF

82.6 KB Created: 2021-04-22 18:09:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 7ff34a5d6de0d87e9ac09ee9482de0ad SHA-1: efbf59ca6f2f60c0fa65134b955fe7c0a8b79d7d SHA-256: da06b41873c33ad023b8a2b2b09051418f5d841ba5366d2ee8e1fa785c7938b4
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, and is flagged by ClamAV as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to 'Healthrider treadmill assembly instructions' to encourage users to click on the embedded malicious URLs. The presence of external URIs and link farm heuristics indicates a strong intent to redirect users to potentially harmful 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://jacksth.ru/strik?utm_term=healthrider+treadmill+assembly+instructions PDF link annotation
    • https://xikematevi.weebly.com/uploads/1/3/4/3/134392378/2315080.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427781/normal_5fe6543b93d4d.pdfIn PDF document text
    • http://giwitijudaleka.mygamesonline.org/zosaroradaxu.pdfIn PDF document text
    • https://bixirugabo.weebly.com/uploads/1/3/0/9/130969405/8c0a09745.pdfIn PDF document text
    • http://nigavereke.mygamesonline.org/introduction_to_arithmetic_theory_of_automorphic_functions.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379982/normal_6068a9e060938.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481067/normal_5fcb2f43cc1a8.pdfIn PDF document text
    • http://lokubakodo.getenjoyment.net/89997602956.pdfIn PDF document text
    • https://tezifotunojoke.weebly.com/uploads/1/3/0/7/130776805/91938b9bbe7437.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472773/normal_5fff5fd8822a6.pdfIn PDF document text
    • https://nozirurabi.weebly.com/uploads/1/3/0/7/130738896/revufisi-pokebixe-xidoxabutu.pdfIn PDF document text
    • http://sagokorize.22web.org/90952865752.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471092/normal_600b1e233494d.pdfIn PDF document text
    • https://musibagufes.weebly.com/uploads/1/3/4/5/134587398/tanunedez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477886/normal_606da4d863608.pdfIn PDF document text
    • http://nokilibetajew.mywebcommunity.org/assemblies_of_god_ghana_constitution.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kitawijarital.epizy.com/biochar_espaol.pdfIn PDF document text
    • http://xewebumobodoris.rf.gd/jagulizumadukojazovep.pdfIn PDF document text
    • http://bapiwixobenilax.rf.gd/cetoacidosis_diabetica_y_estado_hiperosmolar_2018.pdfIn PDF document text
    • http://nanisoz.epizy.com/buzzed_game_cards.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_off000101e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E5 5384 bytes
SHA-256: 441320fbe1df7921fe486c077b7b6031bb20d065e4bbed70d4b8ecc2e9ac333f
font_01_sfnt_off00011403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11403 12040 bytes
SHA-256: 2b6b8d58001cd380d6c1fc247bc3795f2acc74220938910a407a5536b08cf580

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