Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a78ea963f9a6254…

MALICIOUS

PDF

73.5 KB Created: 2021-03-22 06:19:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 3456ca0fddfe65bc99d0efb76492f9f9 SHA-1: 14b1d832a841445f767f6c7aca6d66ce51105836 SHA-256: 7a78ea963f9a62549ad5fefedaacb71a25a6341abf09ee91797d6b90015ba65b
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with a significant number pointing to disposable hosting and link farm patterns, suggesting it's designed to redirect users to potentially harmful sites. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://lozipotod.ru/award?keyword=advanced+adjectives+pdf PDF link annotation
    • https://finolija.weebly.com/uploads/1/3/4/6/134625313/a4b9637c94a.pdfIn PDF document text
    • https://gakewejodum.weebly.com/uploads/1/3/4/9/134902465/virolololer_vujonamebowavow.pdfIn PDF document text
    • http://clubstore.pro/liferagosikyqm33.pdfIn PDF document text
    • https://mupasifuv.weebly.com/uploads/1/3/2/6/132680827/8499984.pdfIn PDF document text
    • http://vzruvayarttraff.xyz/sigexibo2dbjg.pdfIn PDF document text
    • https://roralolew.weebly.com/uploads/1/3/0/7/130775143/nuvemi.pdfIn PDF document text
    • https://japilulijerimu.weebly.com/uploads/1/3/0/7/130738614/3903827.pdfIn PDF document text
    • https://femobideja.weebly.com/uploads/1/3/4/7/134735935/nufoj_sufaped.pdfIn PDF document text
    • https://rulipowijipej.weebly.com/uploads/1/3/0/7/130775545/ad2e7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kepirodineloga.epizy.com/gageki.pdfIn PDF document text
    • https://s3.amazonaws.com/vibasujefir/how_to_repair_a_agitator_in_washing_machine.pdfIn PDF document text
    • http://nagikesedogoru.rf.gd/girivorilapofiduku.pdfIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/dutefimonobukaxepebogeba.pdfIn PDF document text
    • http://dozatajazen.rf.gd/65576940680.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/gojomafedusomitokeri.pdfIn PDF document text
    • http://pasibujaz.epizy.com/mexesamanepefam.pdfIn PDF document text
    • http://katufimeg.rf.gd/classroom_rules_for_high_school.pdfIn PDF document text
    • http://kenenuso.rf.gd/which_midi_keyboard_is_best_for_fl_studio.pdfIn PDF document text
    • https://s3.amazonaws.com/jaloto/cms_grievance_response_letter_template.pdfIn PDF document text
    • https://s3.amazonaws.com/rodakarugupoko/twilight_eclipse_full_movie_download_in_hindi_filmywap.pdfIn PDF document text
    • http://vifoxakusawe.rf.gd/kijitasareloba.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_off0000e260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE260 5148 bytes
SHA-256: bf3e07f31597a62905aac47a5b2725105d3b008a8e8d36e686c010950737c957
font_01_sfnt_off0000f409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF409 10976 bytes
SHA-256: c91cd7352da5b3a64f973f9315f4af1b88cc69521e83f3bdc0fa8b7081a1f938

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