Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f08acdc624776b3…

MALICIOUS

PDF

75.7 KB Created: 2021-02-24 18:35:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 26e5b14cd95e2437c3bac00773106174 SHA-1: 96925c9722107098a209f84c77561f00c1ea3604 SHA-256: 8f08acdc624776b384e135c91be14d4d76b6221722466ca2ab18bc9ca3e72013
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to disposable hosting and redirector infrastructure, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly support its malicious nature. While no scripts were directly extracted, the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=acting+books+for+young+actors In PDF document text
    • http://lazujifoxupa.getenjoyment.net/how_to_clean_ratchet_straps_by_dirt_farmer_jay.pdfIn PDF document text
    • https://wubenigulusetib.weebly.com/uploads/1/3/4/7/134712949/dutexezu-putobapabogubix-demagalivap.pdfIn PDF document text
    • https://madaremowigefin.weebly.com/uploads/1/3/2/6/132681361/letaxanow.pdfIn PDF document text
    • http://wijetaz.mypressonline.com/sojofo.pdfIn PDF document text
    • http://jedomagisuw.getenjoyment.net/61955820460.pdfIn PDF document text
    • http://sisedema.22web.org/android_studio_kotlin_tutorial_for_beginners.pdfIn PDF document text
    • https://metiwefipit.weebly.com/uploads/1/3/1/4/131406934/c63c9a925f86890.pdfIn PDF document text
    • https://ganizosu.weebly.com/uploads/1/3/4/4/134434359/582117.pdfIn PDF document text
    • http://pupalara.22web.org/abp_aprendizaje_basado_en_proyectos_definicion.pdfIn PDF document text
    • https://pobanuritixejun.weebly.com/uploads/1/3/4/6/134601578/1610477.pdfIn PDF document text
    • https://malosopiwa.weebly.com/uploads/1/3/2/6/132695478/ad3e90.pdfIn PDF document text
    • https://gobewuguwug.weebly.com/uploads/1/3/6/0/136056794/wepuxejufegujazamo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nejesezape.myartsonline.com/how_to_reset_bluetooth_earbuds.pdfIn PDF document text
    • http://sirevonigira.epizy.com/egyptian_cotton_bed_sheets_john_lewis.pdfIn PDF document text
    • https://s3.amazonaws.com/popilo/plantas_carnivoras_en_mexico.pdfIn PDF document text
    • http://fopekexu.epizy.com/mawefisubusuturigurarux.pdfIn PDF document text
    • http://fawituwiluke.epizy.com/black_panther_wallpaper_4k_for_pc.pdfIn PDF document text
    • http://sisigetevi.rf.gd/non_chronological_report_writing_template_ks1.pdfIn PDF document text
    • http://luzadewo.epizy.com/3710694772.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_off0000eb64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB64 5312 bytes
SHA-256: dc027e928cad6fb95816c71575f3b59490978b4775fa8cadc0a96cb3883f8798
font_01_sfnt_off0000fd9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9A 10624 bytes
SHA-256: e006dd4ca163cb51a1583cd2d1965a07adf9305f4e2c19b18aced4602c5a5bc6

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