Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5435d275152f8d0…

MALICIOUS

PDF

82.6 KB Created: 2021-01-23 10:47:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: a60920727c3dcfffa69307f7853b101f SHA-1: ef743c485d1919ccb1fcfc0b10063c4693943abf SHA-256: d5435d275152f8d00b81d56c18e4dfcd6bd0c52963a8068eb85e5d2813964104
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely leveraging embedded JavaScript for exploitation or redirection.

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://maypoin.ru/123?utm_term=veterinary+dental+terms PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4377098/normal_5feed44751a9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446147/normal_5fd7a8873d380.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/4PwaWnE/44776177582.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380876/normal_5fd1b986ca356.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414357/normal_600605aa7ec28.pdfIn PDF document text
    • https://cdn.sqhk.co/nanubebebot/28pOsbS/color_by_number_online_animals_for_adults.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481509/normal_6008f52ace802.pdfIn PDF document text
    • https://site-1174025.mozfiles.com/files/1174025/lean_on_me_vocal_sheet_music_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zafovitunopejus.epizy.com/galaxy_attack_alien_shooter_apk_uptodown.pdfIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/luninojovedo.pdfIn PDF document text
    • http://ralivapoked.epizy.com/87350294278.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/information_about_computer_science_field.pdfIn PDF document text
    • http://vinetewexe.epizy.com/aprendizaje_segun_autores.pdfIn PDF document text
    • http://jeruzofifisamen.rf.gd/91844089841.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/lease_brokerage_agreement_form.pdfIn PDF document text
    • http://fefezaw.rf.gd/rs3_woodcutting_guide_2019.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB1 4716 bytes
SHA-256: 9562f15e1573ead304ca0c174d9941bd15babea225a95998ac79f6a2ecca19e8
font_01_sfnt_off00010a93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A93 11048 bytes
SHA-256: b7044bebbf8575cafbc943d0730b018c64b2c4e0b642fac1bb737f441edeba86
font_02_sfnt_off00012f7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F7A 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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