Malicious PDF — malware analysis report

Static analysis result for SHA-256 7369e1714f459974…

MALICIOUS

PDF

81.0 KB Created: 2021-03-09 06:15:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 34179c5c257953c17206effc07f9d6e8 SHA-1: 432ae18595e3532c11dc9d6baf201938149027ff SHA-256: 7369e1714f459974f410e75845b96a67eee0ac606700f80309bbd63cc1a0ca1e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to host numerous PDFs on low-reputation domains, likely to improve search engine ranking for malicious lures or to distribute malware. The presence of external URIs suggests an attempt to redirect the user to potentially harmful content.

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://soxebez.ru/award?keyword=cdi+ignition+system+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408865/normal_6039215f1d3ba.pdfIn PDF document text
    • http://normaa-id.com/48642491593gvh5h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468267/normal_603f475860c56.pdfIn PDF document text
    • https://cdn.sqhk.co/nozelenid/gdjgWXs/grand_phone_pottery_barn.pdfIn PDF document text
    • http://instapriz24.online/simpsons_clue_sheets92adi.pdfIn PDF document text
    • http://podcard2020.site/captain_marvel_4k_trailery0tgl.pdfIn PDF document text
    • http://alphabitx.com/tovedinapalauw6o.pdfIn PDF document text
    • http://goligofalu.medianewsonline.com/what_is_via_character_strengths.pdfIn PDF document text
    • http://photoforce.ru/evanescence_my_immortal_violin_sheet_musicgxral.pdfIn PDF document text
    • http://xaninivinekeni.iblogger.org/bubexujibelilamolo.pdfIn PDF document text
    • http://zuzorovix.scienceontheweb.net/sidoruxat.pdfIn PDF document text
    • https://cdn.sqhk.co/wopidevepip/jghjgoO/shaolin_kung_fu_training_dvd.pdfIn PDF document text
    • http://pelinebaj.mypressonline.com/authors_purpose_activity_4_answer_key.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480402/normal_60397178eea85.pdfIn PDF document text
    • http://katopikinu.22web.org/mastering_the_rockefeller_habits.pdfIn PDF document text
    • http://mikovil.mywebcommunity.org/hp_officejet_7110_network_problem.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vavilomakuv.epizy.com/probability_and_stochastic_processes_homework_solutions.pdfIn PDF document text
    • http://rosukijabadizi.epizy.com/google_chrome_74_beta.pdfIn PDF document text
    • http://rosajeku.myartsonline.com/how_to_clean_a_trane_clean_air_effects.pdfIn PDF document text
    • http://vubelifijam.atwebpages.com/best_books_to_read_for_political_science_majors.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_off0001019a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019A 5032 bytes
SHA-256: b9981d5419412b21f9d09e06c0ea18c8b3513e988121bfb57e4430577e6b5663
font_01_sfnt_off000112ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BA 10616 bytes
SHA-256: 5e9ff7824aea31f4ca3655639457721577ab6dae667e4114fdead8be63638620

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