Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3d834d47c9aa410…

MALICIOUS

PDF

77.2 KB Created: 2021-03-02 20:11:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d6421a312ecae5a1efa68f76a267ab83 SHA-1: 5fb36cdc87e0a7ef41c2029bd0077c28ad69d46f SHA-256: f3d834d47c9aa410ee31e350447bcb0375314732f95395019f3e8b4bccf1ecc9
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one pointing to 'bologen.ru' and another to a link farm on disposable hosting, indicating a phishing or malicious redirection attempt. The document body, though heavily obfuscated, appears to contain product-related keywords suggesting a lure.

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://bologen.ru/123?utm_term=ridgid+12+inch+dual+bevel+sliding+compound+miter+saw PDF link annotation
    • http://technodom11.com/avent_microwave_steriliser_bags_review8mj7q.pdfIn PDF document text
    • http://zoompol.xyz/let_it_be_piano_chords_sheet_musict1ctt.pdfIn PDF document text
    • http://stylecurtains.com/adjetivos_comparativos_y_superlativos_en_ingles_ejerciciosyqtbv.pdfIn PDF document text
    • http://biomanix.best/wanesatuuwqic.pdfIn PDF document text
    • http://gagivukamuw.getenjoyment.net/char_broil_red_grill_instructions.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mipovigubebi.rf.gd/jasogizelofonazusa.pdfIn PDF document text
    • http://pifutujotot.epizy.com/annette_king_s_raid_guide.pdfIn PDF document text
    • http://vokunewegulu.epizy.com/aptitude_questions_and_answers_for_cat.pdfIn PDF document text
    • http://keguwizidolubo.rf.gd/tifofi.pdfIn PDF document text
    • http://tufuripisaren.epizy.com/60802502465.pdfIn PDF document text
    • http://lafatakijuton.epizy.com/56246654288.pdfIn PDF document text
    • http://mowelafawugek.epizy.com/mefobigesijejitiba.pdfIn PDF document text
    • http://vutevesofu.rf.gd/rabitevudo.pdfIn PDF document text
    • http://sugudilun.epizy.com/35853762055.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_off0000ec39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC39 5968 bytes
SHA-256: 50f5547165c2b5dabac7630a2ace999de4fde4ab7c25733a8e342529fda0a729
font_01_sfnt_off0001007a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007A 10996 bytes
SHA-256: c004dd70d69016406dbf45c70bc55426efa70ead125ea6fc04cc30e6fde10bcd