Malicious PDF — malware analysis report

Static analysis result for SHA-256 e06b26986cc49316…

MALICIOUS

PDF

80.5 KB Created: 2021-02-18 07:40:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: b7382facfbae51c4a645eac522419a29 SHA-1: cf6345b60bb2ed4515e7a6183cdae8d3bd7b730e SHA-256: e06b26986cc49316357ac905424a6bd3eb2868339a2bc7ba95f9efaf7f26d25c
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'https://baarspo.ru/strik?utm_term=fujitsu+halcyon+error+code+a1', suggesting a phishing lure related to technical support or error codes. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create PDF documents from web content, further supporting the phishing pretext.

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://baarspo.ru/strik?utm_term=fujitsu+halcyon+error+code+a1 PDF link annotation
    • https://cdn.sqhk.co/xiponamoribo/UiheSif/72255520409.pdfIn PDF document text
    • http://milanomoda-italy.site/36622663839sur3j.pdfIn PDF document text
    • https://cdn.sqhk.co/wotutovebo/fgehjgj/buy_sell_comics_near_me.pdfIn PDF document text
    • http://fasebumexu.iblogger.org/how_long_is_the_grace_period_for_license_renewal.pdfIn PDF document text
    • https://cdn.sqhk.co/gigijuke/d0mXgjJ/tewal.pdfIn PDF document text
    • https://cdn.sqhk.co/towevefizub/cb1mtue/green_diarrhea_covid.pdfIn PDF document text
    • https://cdn.sqhk.co/dejuxafe/PYNigTv/tubi_free_movies_and_tv_shows_apk_download.pdfIn PDF document text
    • http://wgathering.org/25421591613ycisp.pdfIn PDF document text
    • https://cdn.sqhk.co/guzamuvi/IDNEjdX/rudoxofezunafavas.pdfIn PDF document text
    • https://cdn.sqhk.co/zerurukoraju/7hhtia9/vatose.pdfIn PDF document text
    • https://cdn.sqhk.co/pejinijew/kgehdgi/xprofile_gold_mod_apk_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/vedanoderifu/hmrgdRx/baby_care_games_free_download.pdfIn PDF document text
    • http://igrarazuma.info/maturin2u51x.pdfIn PDF document text
    • http://takavejesutep.iblogger.org/vijaleradepolubekefose.pdfIn PDF document text
    • https://cdn.sqhk.co/tubozejo/ijVhixV/rocket_launch_2020_australia.pdfIn PDF document text
    • http://pavajevubuj.iblogger.org/ballerina_movie_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://davojuke.epizy.com/aztech_router_firmware.pdfIn PDF document text
    • http://jeragoka.rf.gd/mevigufepasovogadukan.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/all_bangla_boi.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_off0000fd84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD84 5212 bytes
SHA-256: 0cf60272495526f227933d786da3d6eba5fd0a2e22f7aeb5eb87fdb8c6ce481a
font_01_sfnt_off00010f48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F48 11208 bytes
SHA-256: 2fab045d705a49e8fb1773d097f0f3973e027183383259f5e11add5cfc5a3d2b

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