Malicious PDF — malware analysis report

Static analysis result for SHA-256 564d71e0cebd8c75…

MALICIOUS

PDF

77.6 KB Created: 2021-06-01 14:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9ca2c79cfaa57dd1c37badfe003967c8 SHA-1: 533ce192b7155dc0322fc50fb061c07472e31490 SHA-256: 564d71e0cebd8c753203258ab2c0fdc3750bd880f8ae368e7dbaf1b3ad652879
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xezojetit.ru/123?utm_term=libro+budismo+esoterico+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369308/normal_5fe1b3425b361.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419828/normal_602612f915957.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386824/normal_606b4ba910ed4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408174/normal_606a4034ca4f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492574/normal_6064914dc99b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478928/normal_60641e7a38468.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445729/normal_601e3b96e157a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491426/normal_5ffda803a5ddd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460241/normal_60269cd4df94e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382413/normal_605afcc6afb60.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffb558fc-2168-4e95-98ac-5345c4536a9f/program_management_tools.pdfIn PDF document text
    • http://bamedun.pbworks.com/w/file/fetch/144457704/80976491584.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b41878e9-2156-49d8-8b17-788016aea49d/12693131103.pdfIn PDF document text
    • http://zeladejan.pbworks.com/f/what_temperature_do_you_put_a_ham_in_the_oven.pdfIn PDF document text
    • http://xalomuzavege.pbworks.com/f/gigatexitox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12f4f9f4-7c38-45b0-b0df-e2fe5bfc2563/gesojitafevobuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/272c8953-4ab5-4734-b137-1ef6eec7194b/american_economy_history.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79b1a8f9-be8a-4895-8ce5-56ba2b357d14/can_a_r12_recovery_machine_be_convert_to_r134a.pdfIn PDF document text
    • http://godekazonigi.pbworks.com/w/file/fetch/144431676/9.snf_ingilizce_1.nite_konu_anlatm.pdfIn PDF document text
    • http://memofemovo.pbworks.com/w/file/fetch/144445434/94939191587.pdfIn PDF document text
    • http://lugozamuxika.pbworks.com/w/file/fetch/144411849/20_laboratory_apparatus_and_their_uses.pdfIn PDF document text
    • http://pimepovume.pbworks.com/f/attack_on_titan_season_2_opening_piano_sheet_music.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_off0000f1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A0 5140 bytes
SHA-256: 266641f61bbfcc8cc779c68d0220b95ca9f7011baf3e6f700a0226a3fb02117a
font_01_sfnt_off00010306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10306 11244 bytes
SHA-256: 224275b8083cd782c10f1acca9c6942190c7a8ed59abf07b942a39fd4e5fcd00