Malicious PDF — malware analysis report

Static analysis result for SHA-256 23d36daaf2bb9bfc…

MALICIOUS

PDF

76.7 KB Created: 2021-03-14 09:20:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: f2be32d6d347be418bab1ca4dcb52492 SHA-1: 9e5927d644a5e2021303ceda58e3c5ed6140dc32 SHA-256: 23d36daaf2bb9bfcfc92fc1da5fb7d0beb008117f81bfc028c73991fdf4d74f0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9998

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://pelibifir.ru/strik?utm_term=2006+honda+civic+hybrid+12v+battery+replacement PDF link annotation
    • http://replyua.site/61262038016qns09.pdfIn PDF document text
    • http://spainsale.pro/31774779207k0fxt.pdfIn PDF document text
    • https://cdn.sqhk.co/gelowidabik/Egciijj/10212688729.pdfIn PDF document text
    • http://wazepewazivulil.mywebcommunity.org/xuzosawosopedoremiko.pdfIn PDF document text
    • http://fudazozotakaxal.mywebcommunity.org/leadership_styles_in_organisational_behaviour.pdfIn PDF document text
    • https://cdn.sqhk.co/pipujevi/Lib5hfq/flick_quarterback_20_american_pro_football.pdfIn PDF document text
    • https://cdn.sqhk.co/manigonodapu/gcUjb8p/21391343588.pdfIn PDF document text
    • http://ruxipivufaditij.22web.org/how_to_pay_a_parking_ticket_online_in_california.pdfIn PDF document text
    • http://tk-pobeda.site/logitech_controller_f710_driver_windows_10sz8c4.pdfIn PDF document text
    • http://bibotabelik.22web.org/luxerejunase.pdfIn PDF document text
    • http://dreamingdeveloper.com/al_que_esta_sentado_en_el_trono_piano_tutorialfeeho.pdfIn PDF document text
    • http://junumidutuzakox.getenjoyment.net/8648803753.pdfIn PDF document text
    • http://nasty666.space/can_low_transmission_fluid_cause_engine_light_to_come_onh8p46.pdfIn PDF document text
    • http://uniques.space/the_crown_netflix_seriesev9q9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://memamawu.onlinewebshop.net/plantronics_voyager_legend_bluetooth_headset_schwarz.pdfIn PDF document text
    • http://dudakitulefuteg.rf.gd/vidmate_er_movie.pdfIn PDF document text
    • http://xowilewegiwo.myartsonline.com/what_foods_were_eaten_in_ancient_greece.pdfIn PDF document text
    • http://bebojivim.myartsonline.com/john_deere_la135_weight.pdfIn PDF document text
    • http://kaxuwenewutexu.myartsonline.com/42532681080.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_off0000ecd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD6 5824 bytes
SHA-256: c36a107c0069326f25a0937c9c9a8d1db752abecf5dad55ce15a2ffb04c8bc83
font_01_sfnt_off00010085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10085 10772 bytes
SHA-256: a3968155d1480803101a20fca15e3c37322855a462112555e153e32d9d6cd3a3

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