Malicious PDF — malware analysis report

Static analysis result for SHA-256 87e96357eceded73…

MALICIOUS

PDF

70.9 KB Created: 2021-02-17 21:42:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 86eff0f9f18f555b67544a25d5e5de6c SHA-1: 92acf08e2a14acb412929528a6551728fb225040 SHA-256: 87e96357eceded73899cd6e85958c3d4ba919e3e590e33e4275caf64eec30e38
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to a '2001 jeep grand cherokee owners manual', which is likely a pretext to encourage clicks on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/strik?utm_term=2001+jeep+grand+cherokee+owners+manual PDF link annotation
    • https://cdn.sqhk.co/parabeset/hgjFYAN/sediwokukaxibapejamujum.pdfIn PDF document text
    • http://hookup754.fun/durchschnittliche_nderungsrate_aufgabenulysf.pdfIn PDF document text
    • https://cdn.sqhk.co/zipirevofu/Ehiujhh/nubifolakebofegonuv.pdfIn PDF document text
    • http://skidki-day.shop/starsector_fleet_guideeyonl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459791/normal_5fe127d4ca205.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422627/normal_5ff5be36b50cc.pdfIn PDF document text
    • http://icub.tech/towenabukosixut9fa.pdfIn PDF document text
    • https://cdn.sqhk.co/surixirulol/jfje8jb/mercs_of_boom_review.pdfIn PDF document text
    • http://dithetsen.xyz/what_are_the_five_elements_of_an_argumentyc2uh.pdfIn PDF document text
    • http://muzhskoizhurnal.ru/goons._io_knight_warriors_unblockedup7g6.pdfIn PDF document text
    • https://cdn.sqhk.co/xagaxubibiz/hciiajj/67212179894.pdfIn PDF document text
    • http://oneshops.space/48436488779y75t6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443824/normal_5ff544d1032e4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370068/normal_5fc8b3e6e9bd5.pdfIn PDF document text
    • https://cdn.sqhk.co/gegenosuzun/NLuhfWZ/tabletop_simulator_games_for_2.pdfIn PDF document text
    • http://scoretdho.best/gijofowonulukowadono3isse.pdfIn PDF document text
    • http://bottlechainworld.com/ecosystem_worksheet_high_school1yoc0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383797/normal_6003cde069e9c.pdfIn PDF document text
    • http://verifedform.com/vafevokijazaxfwfvh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d5e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E1 5948 bytes
SHA-256: cef709af504e522e851d8d26fc763e963a7b5191f9e8fd4f04e6ab512d2587e1
font_01_sfnt_off0000ea1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1A 10588 bytes
SHA-256: bfc7256a830f82b57a75ae745869d917b11f3c5a2c315115179216671af3e967

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