Malicious PDF — malware analysis report

Static analysis result for SHA-256 f524abf3b690eff7…

MALICIOUS

PDF

94.1 KB Created: 2021-03-08 17:11:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f1fc955489bc93fd9c4afe30475405af SHA-1: d5a3da080d43ed5a6459e652dffd5f9293c1c314 SHA-256: f524abf3b690eff719d25831cfe0b4a6ceb58d0b817a2498c6dbe20e4228256f
166 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. It uses a password-protected-archive lure. 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 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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://baarspo.ru/strik?utm_term=fundamentals+of+thermodynamics+8th+edition+solution+manual+borgnakke+sonntag+pdf PDF link annotation
    • http://return-0.com/bob_gear_revolution_flex_3.0_duallie_stroller43nit.pdfIn PDF document text
    • http://znakomstva18x.site/58792445291q5w4z.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500665/normal_600a7a4301ef4.pdfIn PDF document text
    • http://salukapebuke.iblogger.org/migokepezukirimi.pdfIn PDF document text
    • http://wide-do.top/get_rich_carefully_redditc6wb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468296/normal_5fdc7afc759cb.pdfIn PDF document text
    • http://sexesex.site/6236480144711h22.pdfIn PDF document text
    • http://devgame.design/mukawogwmwvd.pdfIn PDF document text
    • http://dontbeshy.xyz/duzufawegokuvov3pid.pdfIn PDF document text
    • http://getliterate.online/financial_management_theory_and_practicekobhw.pdfIn PDF document text
    • http://chelobaka.space/salon_de_belleza_mario_bellatin_analisisv0gpe.pdfIn PDF document text
    • http://strahuemsya.info/what_is_indian_coast_guard_navik_gd71xzu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467612/normal_600e48598ff98.pdfIn PDF document text
    • http://wisitens.online/aquaventure_water_park_dubai_wikipediay3gd1.pdfIn PDF document text
    • http://vedevejunogi.iblogger.org/zeros_of_polynomial_functions_worksheet_with_answers.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/ad6e758d-84ae-455a-95f9-16260af099d1/39979037952.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/090f4807-5297-48f2-afd0-ce098e4a6001/what_is_classical_economic_thought.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec97ab33-1045-41ea-acbb-2f750dad8483/garmin_astro_320_manual_en_espaol.pdfIn PDF document text
    • http://relizaki.epizy.com/26740047108.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e483bafc-b7d1-4698-8719-7c19e00529fd/gigumamonuwoladeda.pdfIn PDF document text
    • http://tevoburowuvule.epizy.com/muwiretinowuwolanetok.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00014687.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14687 20284 bytes
SHA-256: 1bf1bb8c4983a9a5e0c9a6a8b37631eb8c2507f25f583f61f1ea4573870c0fd1
font_00_sfnt_off00010be2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE2 6024 bytes
SHA-256: c760e1e495aaa498e12da48f37d5a10b6c45c0c1dc63587ca1e09b993e111f0e
font_01_sfnt_off00012044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12044 11240 bytes
SHA-256: b6de7e078d3de2a2b98be31cf90387bce1630be113d0d178a6c90c7223f0f03a