Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a97f90267243f4a…

MALICIOUS

PDF

101.4 KB Created: 2021-02-26 02:16:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 4c2f3eb2319855d672605ad318ba7e47 SHA-1: 75a152c6199e8153e3419ecf5ab1b1e295c6de28 SHA-256: 2a97f90267243f4a41c8ef36ad8056ec1d520df196797ad4c5d863922dbe4158
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. The document body, though heavily obfuscated, contains metadata suggesting it's masquerading as a service manual to entice clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/award?keyword=pioneer+vsx-524+service+manual PDF link annotation
    • http://koteyarn.moscow/2776521739jmvge.pdfIn PDF document text
    • http://avto-trokot.xyz/puzuxukuwe3zjee.pdfIn PDF document text
    • http://eagleaff.com/13094135345nkw72.pdfIn PDF document text
    • http://zisuroto.mygamesonline.org/what_is_the_main_idea_of_rumpelstiltskin.pdfIn PDF document text
    • http://stroymarketmetal.ru/34187867190tofii.pdfIn PDF document text
    • http://free-at.pro/positivismo_juridico_librosd0t74.pdfIn PDF document text
    • https://lutaxebibutemun.weebly.com/uploads/1/3/1/3/131380730/vunirixu-jewafomu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/febopa/toloxubapidalu.pdfIn PDF document text
    • http://gevewodex.epizy.com/51701529535.pdfIn PDF document text
    • https://s3.amazonaws.com/jefobexapulow/jakoselofiditu.pdfIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/bsc_math_books.pdfIn PDF document text
    • https://s3.amazonaws.com/nojemi/olympic_fanfare_sheet_music.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_off00014442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14442 5452 bytes
SHA-256: cf6f2825510af342936b705025c7c4110cbbdb8198d52e85e10a0e65ab9f58ad
font_01_sfnt_off000156d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156D8 15576 bytes
SHA-256: a90f2734bccfc15de241db6045aaa87251d1b6b5c22c765169da74590474d933

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