Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef3f92aa7c916520…

MALICIOUS

PDF

76.8 KB Created: 2021-03-04 00:45:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e456e6d80bbaf1280ad5546366ff4a9a SHA-1: 29d08545b92d36222d2854225b4cbae889b25c66 SHA-256: ef3f92aa7c916520b5f8dc898291650fbcdbfc44c1ddebabeb74a1f2b2720e2b
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML classifiers and ClamAV, indicating malicious intent. It contains numerous embedded URLs pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The presence of external URIs and the 'link farm' heuristic strongly indicate an attempt to redirect users to potentially harmful sites.

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
  • 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://dafemum.ru/123?utm_term=best+data+science+books+2019+pdf
    • http://somixewavado.sportsontheweb.net/50009697081.pdf
    • http://tuzazigigub.iblogger.org/razovisutizu.pdf
    • http://vajukadezazi.getenjoyment.net/encpt_nutrition_diagnosis_terminology.pdf
    • http://dotixomovi.sportsontheweb.net/56721340407.pdf
    • http://sitizinudex.getenjoyment.net/vintage_muscle_cars_for_sale_near_me.pdf
    • http://katipef.medianewsonline.com/divx_converter_serial_number_crack.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://pigozezidum.rf.gd/vuxudewarotasovep.pdf
    • http://ximumipos.rf.gd/semadisawowonuluvu.pdf
    • https://s3.amazonaws.com/jotizifime/1798106179.pdf
    • http://gozakovojuri.rf.gd/the_reluctant_fundamentalist_full_movie_free.pdf
    • http://nibemodida.myartsonline.com/ketilawini.pdf
    • http://dowupozor.epizy.com/nhs_full_business_case_template.pdf
    • https://s3.amazonaws.com/pipaneku/extech_ex330_datasheet.pdf
    • https://s3.amazonaws.com/purixifusipelid/workout_log_template.pdf
    • http://fowimifefezujo.myartsonline.com/kofalelegamiwatu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0d1.bin
be07c0d6f7f4b3d9de36add7d874abca6583e14c06765df2763b047c475528dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D1 5544 bytes
font_01_sfnt_off0000f3b9.bin
6c8d3f71e48f7e670060ebfb57bf228709730922d263609bdb7d897c4ffb789b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B9 10652 bytes
font_02_sfnt_off000117ed.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117ED 4324 bytes

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