Malicious PDF — malware analysis report

Static analysis result for SHA-256 96bb2e02cbc7f28b…

MALICIOUS

PDF

80.0 KB Created: 2021-02-28 08:02:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 2815edc6e9843634409ba03a1897d937 SHA-1: f2f35a57f7b23e03a12f0eb259208563ccc34130 SHA-256: 96bb2e02cbc7f28bc5d8724490d14c572906e98afe29277fbd4916140a5275f4
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://xajibur.ru/strik?utm_term=fixed+income+mathematics+fabozzi+pdf+download PDF link annotation
    • https://wopadutizibum.weebly.com/uploads/1/3/4/3/134306931/6802309.pdfIn PDF document text
    • https://vumiluvitut.weebly.com/uploads/1/3/2/6/132696113/e59a6760354126d.pdfIn PDF document text
    • https://bubosetew.weebly.com/uploads/1/3/4/5/134515161/25a4a1b.pdfIn PDF document text
    • http://rubewox.sportsontheweb.net/what_is_a_tracfone_sim_kit.pdfIn PDF document text
    • https://sesadawaroni.weebly.com/uploads/1/3/5/2/135295108/19b0d239564bb.pdfIn PDF document text
    • http://tonedomopoja.scienceontheweb.net/how_to_tell_if_diesel_fuel_pump_is_bad.pdfIn PDF document text
    • http://vifezitenof.getenjoyment.net/19475512436.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448718/normal_5fc603a4956d5.pdfIn PDF document text
    • https://lijotabele.weebly.com/uploads/1/3/4/0/134016876/71e40b7300fd200.pdfIn PDF document text
    • http://tulomodev.getenjoyment.net/how_to_calculate_man_days_worked_in_a_year.pdfIn PDF document text
    • https://bumovewadenol.weebly.com/uploads/1/3/5/3/135318567/zejekuluvo-xozijugomijosa-boxik-xudadi.pdfIn PDF document text
    • https://likuwiwekadu.weebly.com/uploads/1/3/1/8/131857000/xafesivezimu.pdfIn PDF document text
    • http://bunnygummy.ru/momuzijogatajizet6a8kn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://keregimuw.onlinewebshop.net/a_confederacy_of_dunces_ignatius_character.pdfIn PDF document text
    • http://vujapoguxesak.myartsonline.com/a_simple_favour_trailer_ita.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_off0000f8d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D7 5604 bytes
SHA-256: 3ac262050ed30882905c0c0267d3dc5f96691e8b581d6c0b7406da8ad115dfc5
font_01_sfnt_off00010be2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE2 11464 bytes
SHA-256: 968c194aa23513e667b5d5f6aa75b2d4f2797bee1709f4159f0a7878129b5586

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