Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7f58fd594301b25…

MALICIOUS

PDF

74.3 KB Created: 2021-02-18 17:27:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a99f59fff9a2e6a78292bd4a2172c93e SHA-1: c2fec8b1d960d968b523b8e86e40d5954a8c6b34 SHA-256: e7f58fd594301b25400742e75ba6818de50dedc01b132d6146137a905e700be9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, and contains numerous embedded URLs pointing to disposable domains. The document body, though heavily obfuscated, suggests a lure related to a thermostat manual, which is a common tactic for phishing or malware distribution. The presence of many external links indicates a link farm designed to redirect users to potentially malicious sites.

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://jacksth.ru/strik?utm_term=honeywell+th8000+thermostat+installation+manual PDF link annotation
    • https://cdn.sqhk.co/rodofusavivi/jehaSgi/blackpink_the_album_version_4.pdfIn PDF document text
    • https://cdn.sqhk.co/xorilulog/hhcighg/vr_guide_aquatica_orlando.pdfIn PDF document text
    • https://cdn.sqhk.co/nudizodi/hfNghPB/download_game_crazy_trucker_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492246/normal_5fd5f0f7cf5e9.pdfIn PDF document text
    • http://ceiling48.ru/vowewabodugajijosakemezo3zljq.pdfIn PDF document text
    • http://triple-doska3.club/a_guide_to_modern_econometrics22idx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469626/normal_6016f60d847a0.pdfIn PDF document text
    • https://cdn.sqhk.co/pukikojat/gjM9gib/xejajifuzaj.pdfIn PDF document text
    • http://mandarins.space/mastering_bitcoin_programming_the_open_blockchain15ufk.pdfIn PDF document text
    • https://cdn.sqhk.co/kipaselofuza/e8pu6gc/zodosun.pdfIn PDF document text
    • http://kotexob.iblogger.org/comparing_numbers_worksheets_4th_grade.pdfIn PDF document text
    • http://bbcua.site/pejefudelatogavm8siv.pdfIn PDF document text
    • https://cdn.sqhk.co/pibilebomek/rZyicyb/tupulozadibiburagodev.pdfIn PDF document text
    • http://nibobokil.66ghz.com/python_language_reference_manual.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473651/normal_5fe333621b90d.pdfIn PDF document text
    • https://cdn.sqhk.co/kajipazuto/ic5btgd/garoxelekojofa.pdfIn PDF document text
    • http://frasqen.online/software_asset_management60wz1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FE 5296 bytes
SHA-256: 6f11386ad6ead418ca7584e240c2f18bdf1ffa5be05c240a96fb533947041aca
font_01_sfnt_off0000eadf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADF 10220 bytes
SHA-256: fb350e1123fc135ad03b9d87a1ae35b5b47f7c3299f1971d6da0a966cda83c82
font_02_sfnt_off00010de1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE1 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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