Malicious PDF — malware analysis report

Static analysis result for SHA-256 55d3a6a72fd61e20…

MALICIOUS

PDF

77.0 KB Created: 2021-04-07 10:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 0ba11f7da22b8a2c3f8c9652197c7e8b SHA-1: 1fe9f211ca3bb3ecc284ced8119a6467fff0c6e1 SHA-256: 55d3a6a72fd61e2067e8078963ef81d9478d3d1aa2c7f3e64a5060d1528407e8
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely to redirect users to phishing sites or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://ponafet.ru/123?utm_term=canon+70d+manual+mode+tutorial PDF link annotation
    • https://cdn.sqhk.co/dodamewope/jcjgiqp/best_notification_ringtones_2020.pdfIn PDF document text
    • http://mumijivamivaxij.medianewsonline.com/11295065904.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409123/normal_5ff77644bba34.pdfIn PDF document text
    • https://cdn.sqhk.co/dedatemaran/jhgVFia/79232937073.pdfIn PDF document text
    • http://xalowazejadiv.getenjoyment.net/fimupirirafoze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384639/normal_60192538108e1.pdfIn PDF document text
    • https://cdn.sqhk.co/ninazixador/icOZgeH/germany_flag_colouring_sheet.pdfIn PDF document text
    • https://cdn.sqhk.co/vilomikov/hcGXid2/sikasanek.pdfIn PDF document text
    • https://cdn.sqhk.co/puwukuwos/jTibxjb/apprentice_electrician_jobs_ireland.pdfIn PDF document text
    • https://cdn.sqhk.co/kipaselofuza/wiiYmid/radiant_heat_manifold_parts.pdfIn PDF document text
    • https://cdn.sqhk.co/tinolaseja/TifhdJW/word_attack_skills_worksheets.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e924225a-aa46-4bfc-8e56-7341551e1833.filesusr.com/ugd/54dfea_6487cb078b1441c181f9868d8f7945d3.pdf?index=trueIn PDF document text
    • http://xukokumo.myartsonline.com/candidose_digestive_traitement.pdfIn PDF document text
    • https://2ddedb0e-b7b0-41c9-a8bc-c018bd0e6e4c.filesusr.com/ugd/70094d_9808e77b69934e5f93a4b65b69a49451.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tadevewuju/rational_and_irrational_numbers_puzzle_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/bisazabe/21877043100.pdfIn PDF document text
    • http://jorasixu.myartsonline.com/itinerary_definition.pdfIn PDF document text
    • https://e0bfa911-60eb-4c53-bd8d-ceec25156dfb.filesusr.com/ugd/0a052f_c4a414843b804fbeb76c7edcdc5ef1f1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sitozi/rabunado.pdfIn PDF document text
    • http://zogadawedalifap.onlinewebshop.net/the_abundance_book_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/mujevubutukoxu/how_to_rekey_schlage_lock_without_a_key.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_off0000ede0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE0 4920 bytes
SHA-256: 427afd902a7686825002a124a098f2c216abcbc9ba6aa6304632a82a351bf4d0
font_01_sfnt_off0000fe86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE86 11812 bytes
SHA-256: 9ea739df21e2dc58192a0f41fbb744bb547d5f8f2602201c9be10975b94291f3