Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e110a61ee5fd085…

MALICIOUS

PDF

77.0 KB Created: 2021-02-28 16:03:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 55e0fce3abfd10f195081d030ccc397e SHA-1: e52a79703cc923ad171457791bb0b175bd59be06 SHA-256: 8e110a61ee5fd0859bc9d2249a2c222478526059774ebe4ef350b214af2f13f2
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing campaign. One URL, 'https://bologen.ru/123?utm_term=2006+dodge+stratus+headlight+bulb+replacement', appears to be a lure, possibly related to search engine optimization or a phishing pretext. The PDF structure and embedded content indicate it's designed to redirect users to malicious sites.

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/123?utm_term=2006+dodge+stratus+headlight+bulb+replacement PDF link annotation
    • http://kidepokapila.22web.org/master_yi_guide_farm.pdfIn PDF document text
    • http://kawotasurigexa.iblogger.org/81803995540.pdfIn PDF document text
    • http://rorureferujuraf.22web.org/thinkscript_addorder_trailing_stop.pdfIn PDF document text
    • https://cdn.sqhk.co/powirafawume/dNigjgQ/know_your_meme_monkey_looking_away.pdfIn PDF document text
    • http://honbiz.pro/hm_new_size_guide_uksj79m.pdfIn PDF document text
    • https://cdn.sqhk.co/vopofuxo/ihgghhb/neon_yellow_long_sleeve_running_shirt.pdfIn PDF document text
    • https://cdn.sqhk.co/famuxina/ijchigg/tolikufaro.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://fijinibegomiba.rf.gd/high-_level_panel_on_digital_cooperation_report.pdfIn PDF document text
    • http://xakagigoneliv.myartsonline.com/sevulakodiridaxobolel.pdfIn PDF document text
    • http://bazogito.epizy.com/all_thats_solid_melts_into_air.pdfIn PDF document text
    • http://nozulorot.epizy.com/andromeda_galaxy_picture_1._5_billion_pixels.pdfIn PDF document text
    • http://duzoweserunojoj.epizy.com/lisekasagejitukis.pdfIn PDF document text
    • http://kosezofejesuxef.atwebpages.com/45691028756.pdfIn PDF document text
    • http://newemepakirid.myartsonline.com/augusto_ghio_ingles_basico_descargar.pdfIn PDF document text
    • http://rukosivujuxu.atwebpages.com/45943363837.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_off0000e1f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F3 5844 bytes
SHA-256: 71b2f5d18a6df143bcad73b521187daaf3a3fdd8c3ff350b0d877c606a74bdb4
font_01_sfnt_off0000f592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF592 10224 bytes
SHA-256: 5e7eb8c5f9f8600d0a73e6f7247bf66700fa5f1188ae3916190c26a8bc9a82da
font_02_sfnt_off0001189f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189F 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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