Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b8f5c8a703a27fa…

MALICIOUS

PDF

68.0 KB Created: 2021-04-02 20:13:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25bf9cfcd6fb03890800f7624e4dbc93 SHA-1: a11b8fc0127f811d6492b5234d4d2794140f46ab SHA-256: 1b8f5c8a703a27fa90fe7d9d2284a3dd6d4f6fb99a4c6e0ca4b2f333cab19df6
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified by heuristics and a ML classifier as malicious. ClamAV also detected it as a phishing trojan. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious documents. The primary IOC is the external URI used for the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/strik?utm_term=farmer+boy+ag+illinois
    • https://cdn.sqhk.co/nisugavu/gfjdib6/pc_games_more_about_ancient_egypt.pdf
    • https://cdn.sqhk.co/gonolesuzam/arKjc7h/pirobubuzatiwipejizitot.pdf
    • http://xabigaxen.22web.org/zesadasegogisu.pdf
    • https://static.s123-cdn-static.com/uploads/4493881/normal_5ff0c699cf20c.pdf
    • https://cdn.sqhk.co/romafime/iIVoAia/sobedelabazoleboxawana.pdf
    • https://cdn-cms.f-static.net/uploads/4386618/normal_6028faf1edb74.pdf
    • http://busigexexowo.22web.org/arihant_encyclopedia_of_general_science_free_download.pdf
    • https://cdn.sqhk.co/neseleko/hbhh7jg/55978770531.pdf
    • https://cdn.sqhk.co/degavorofala/ijjjbgd/how_to_redeem_globe_rewards_kfc.pdf
    • http://fapenas.22web.org/linkedin_phishing_email_template.pdf
    • https://cdn-cms.f-static.net/uploads/4374535/normal_5fe6c7cfc5055.pdf
    • http://zenigegobub.iblogger.org/kijefeligoki.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gelawiweza/how_to_start_a_writing_business_online_uk.pdf
    • http://puwagof.rf.gd/bendy_and_the_ink_machine_free_apk.pdf
    • http://zopopujeji.rf.gd/federalist_51_questions_and_answers.pdf
    • https://s3.amazonaws.com/dobesogum/does_stretching_everyday_make_you_more_flexible.pdf
    • http://gapexer.rf.gd/perewelosi.pdf
    • http://dadiriruz.epizy.com/2012_hyundai_sonata_limited_for_sale_under_5000.pdf
    • https://s3.amazonaws.com/xeroguru/chorioamnionitis_rcog.pdf
    • http://tatasuvuputo.epizy.com/32188881003.pdf
    • http://baxivus.epizy.com/astronomy_and_astrology.pdf
    • https://s3.amazonaws.com/bofake/89191237176.pdf
    • http://goseletew.epizy.com/emphasis_of_matter_in_audit_report.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb17.bin
c3af8a0eaa7e9f53480ad09d0bfc8e3c4a4bbd3405ea189c28d4fd2dea9d1a26
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB17 5204 bytes
font_01_sfnt_off0000dcbe.bin
f90ee502dfbf9a66d46e60373400489e58797bdad745a905a23298277bdb0097
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBE 10616 bytes