Malicious PDF — malware analysis report

Static analysis result for SHA-256 f40f93d155faa2a9…

MALICIOUS

PDF

78.9 KB Created: 2021-03-14 05:04:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 02ad7fb39e3545a9b723103556b45634 SHA-1: 2eddf779452b44f12803a415b55845de35ca2ca4 SHA-256: f40f93d155faa2a980a1b113913242c46b10fe3a20909b9cf13641c78def419d
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, including one pointing to 'leonvi.ru', which is likely part of a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is designed to host many links on disposable domains, further supporting a malicious purpose.

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://leonvi.ru/strik?utm_term=stanley+tre550+manual PDF link annotation
    • https://cdn.sqhk.co/sexuzoropa/ighwhje/80388179014.pdfIn PDF document text
    • https://cdn.sqhk.co/linidivez/zEgg9VD/consumer_reports_appliances_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/pabefidinaz/jxigLic/border_light_wallpaper_iphone_11.pdfIn PDF document text
    • https://cdn.sqhk.co/linerutinew/njfRig3/reversi_free_application.pdfIn PDF document text
    • https://cdn.sqhk.co/fatobaliv/ehfgeKy/vifapo.pdfIn PDF document text
    • http://velesvoyage.ru/chins_petition_form_massachusettsz3cdd.pdfIn PDF document text
    • https://cdn.sqhk.co/zulatobi/hibtiii/75548782313.pdfIn PDF document text
    • https://cdn.sqhk.co/nupozifulija/gjicjdC/54535013681.pdfIn PDF document text
    • https://cdn.sqhk.co/gufezitaxato/aghjehh/5266557341.pdfIn PDF document text
    • https://cdn.sqhk.co/gebitasixa/jgcahcZ/74263988193.pdfIn PDF document text
    • https://cdn.sqhk.co/fusozuwalas/2gfjic2/file_csv_format.pdfIn PDF document text
    • http://didegubopefu.22web.org/youth_ministry_curriculum.pdfIn PDF document text
    • http://cuzinfo.ru/91474234816y5j6k.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mekebinaga.rf.gd/29977996745.pdfIn PDF document text
    • http://votagunuk.rf.gd/antec_900w_power_supply.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd06a473-1b6a-4500-abe2-cf24bf0cd5ec/favupexinisalavamatuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d671af6-e257-40c4-8505-80389b4c6ff9/voodoo_lab_pedal_power_2_plus_brackets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/038bd85b-7e66-4673-88d1-a0e935a40b28/english_literary_devices-_definition_with_examples.pdfIn PDF document text
    • http://nolumuj.epizy.com/matrices_objective_questions_and_answers.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_off0000f6cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CB 5124 bytes
SHA-256: 31aa1338b9f49c1604dc6758b1cb2f6f9aed87c57347d1c82571ab332869db07
font_01_sfnt_off00010823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10823 11380 bytes
SHA-256: f49e73b8d475cdfecc6257e836ea81799328f68d4b309464f67b767565a15a8f

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