Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a58a5b92e2b1f66…

MALICIOUS

PDF

67.6 KB Created: 2021-03-28 09:44:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 34e40e9a1cd19c8130fd753fa2d78836 SHA-1: 46aac465869a7a32a35fdfd72ab08f6ebdc29cf9 SHA-256: 3a58a5b92e2b1f66b0c27851eb14a48c6c8ccf13216300418e6337477b471c6e
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. Heuristics indicate it's a link farm on disposable hosting and has been flagged by ML and ClamAV as malicious phishing content. The document body, though heavily obfuscated, contains references to 'generator parts manual' and 'wkhtmltopdf', indicating a deceptive pretext to drive users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/wix?keyword=honda+es6500+generator+parts+manual PDF link annotation
    • http://wusokamojifel.scienceontheweb.net/direccin_de_sanidad_polica_nacional.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416934/normal_603128cbae325.pdfIn PDF document text
    • http://megepibetosuse.22web.org/82525483156.pdfIn PDF document text
    • https://cdn.sqhk.co/dasotipamu/gH2jeje/street_fighter_iv_hd_apk_obb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415531/normal_6028adbe38197.pdfIn PDF document text
    • https://cdn.sqhk.co/gizukakom/f9iiaeM/euro_car_simulator_2_game_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/woxekivepi/fjjHgdS/dunkin_donuts_charli_drink.pdfIn PDF document text
    • https://cdn.sqhk.co/febowozefu/gebibdY/nubenikujuxuvujem.pdfIn PDF document text
    • https://cdn.sqhk.co/giruzegovu/ejgniSa/my_boost_app_website.pdfIn PDF document text
    • http://vopugixeroramox.medianewsonline.com/how_to_change_chime_on_carlon_wireless_doorbell.pdfIn PDF document text
    • https://cdn.sqhk.co/winogolelog/geAOJhg/xujifetipeza.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374178/normal_5fe0ddd0aeb24.pdfIn PDF document text
    • https://cdn.sqhk.co/jugomuzuteb/diehfWP/red_and_blue_game_arizona_2019.pdfIn PDF document text
    • http://gapagal.mywebcommunity.org/rubesofososedutemobox.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/niporofez/libro_11_minutos_resumen.pdfIn PDF document text
    • http://bavufupuvamopaf.atwebpages.com/48166482268.pdfIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/34918448450.pdfIn PDF document text
    • http://sokexodine.rf.gd/97668402024.pdfIn PDF document text
    • http://rovizomaguwex.atwebpages.com/motorola_xts_1500_buttons.pdfIn PDF document text
    • http://laxisix.epizy.com/sharepoint_for_beginners_2020.pdfIn PDF document text
    • http://wujaxon.rf.gd/uk_accounting_books.pdfIn PDF document text
    • http://keruxenuriwi.epizy.com/10823366484.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_off0000ca4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4F 5660 bytes
SHA-256: e84284f11ad6a8dae2f714e7e7fa5d423c0d71ee63d1adaa9a034c76607bad1b
font_01_sfnt_off0000dd70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD70 10480 bytes
SHA-256: 55713754e3be9f6d50f5d23b6725c871c1181cc14e60704ae457a93568bed130

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