Malicious PDF — malware analysis report

Static analysis result for SHA-256 f93a4befac4bdb08…

MALICIOUS

PDF

67.6 KB Created: 2021-02-24 22:40:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e9a3a970e460ecac9faf639e47236914 SHA-1: 496ef81aa419a01f76a4d23c458c1eabf82994eb SHA-256: f93a4befac4bdb0842e05a327db2f10fcf8959c1a2fa133e10e6ae823e8fc13c
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 domains, and is flagged by heuristics as a link farm designed for phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further payloads or conducting phishing attacks. Although no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious 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://bologen.ru/strik?utm_term=technivorm+moccamaster+parts+list PDF link annotation
    • http://tapozifokun.mywebcommunity.org/how_to_find_x_and_y_components.pdfIn PDF document text
    • https://cdn.sqhk.co/gukugifixija/3ERgcGV/defender_24_7_reviews.pdfIn PDF document text
    • http://manamuposa.getenjoyment.net/supoxebevedo.pdfIn PDF document text
    • https://cdn.sqhk.co/lojosexotak/ii9iiZu/play_chess_with_friends_on_your_phone.pdfIn PDF document text
    • https://cdn.sqhk.co/fopeziriga/icjisjI/xoteluboxinajutesaxap.pdfIn PDF document text
    • http://pemufosapakem.mypressonline.com/canon_mg3520_wireless_setup_iphone.pdfIn PDF document text
    • http://rajukilodagoje.mygamesonline.org/35379923275.pdfIn PDF document text
    • http://pofuxubilet.sportsontheweb.net/second_grade_spelling_worksheets.pdfIn PDF document text
    • http://fesotisifofil.mygamesonline.org/dijasajuvipofu.pdfIn PDF document text
    • https://cdn.sqhk.co/dijobika/5jcicL5/best_t_mobile_deals_for_existing_customers.pdfIn PDF document text
    • http://terugate.mypressonline.com/18484247144.pdfIn PDF document text
    • http://wedipum.mygamesonline.org/the_law_of_the_garbage_truck_book.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vujapoguxesak.myartsonline.com/what_types_of_intermolecular_forces_are_present_in_ammonia.pdfIn PDF document text
    • http://lobopekogolo.onlinewebshop.net/kakilafi.pdfIn PDF document text
    • http://pawajoxonebozew.rf.gd/85646280913.pdfIn PDF document text
    • http://bivojeda.atwebpages.com/63562246473.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_off0000cc4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4A 5180 bytes
SHA-256: 0a99e682f7499e310fcd7424a6a4e6f4953ee94e63bbf0333b359fb313bda1ef
font_01_sfnt_off0000ddbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBF 10388 bytes
SHA-256: 67b6ed757bf7892a4d2edebd915232203a49f24258e88878d6f8ec1582c54a06

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