Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8d3c2f83ee1d704…

MALICIOUS

PDF

68.3 KB Created: 2021-02-25 12:31:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f3fdc02a2eeb34f6f08e44bb42a45337 SHA-1: 467f84743ee63dc557a46345df92cbea5f54ad82 SHA-256: c8d3c2f83ee1d70468b480bd66c663116de022e04143593a92d72fcf1b3288da
126 Risk Score

Malware Insights

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

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://leonvi.ru/123?utm_term=who+is+inquisitormaster+dating+2020 PDF link annotation
    • http://wapajojakazewi.iblogger.org/livin_on_a_prayer_saxophone_sheet_music.pdfIn PDF document text
    • http://fefiwizam.sportsontheweb.net/what_does_f21_mean_on_a_maytag_4000_series_washer.pdfIn PDF document text
    • https://cdn.sqhk.co/noloxunipe/jeigjit/ominous_badland_winch.pdfIn PDF document text
    • http://itdiscounts.info/cabin_fever_3_dual_audio_720pweml7.pdfIn PDF document text
    • https://cdn.sqhk.co/lilaxikixo/d4iejcH/ai_with_python_code.pdfIn PDF document text
    • http://pogawubujogeje.mypressonline.com/what_are_the_requirements_to_become_a_real_estate_agent_in_victoria.pdfIn PDF document text
    • https://cdn.sqhk.co/simikimira/fhaVpeO/xixosasivulupewida.pdfIn PDF document text
    • http://pegajopakazo.22web.org/buwebesuvul.pdfIn PDF document text
    • https://cdn.sqhk.co/xawobovuji/tnhhgiJ/53912561310.pdfIn PDF document text
    • http://wejuzofibab.medianewsonline.com/warof.pdfIn PDF document text
    • http://fertpin.online/assassin_s_creed_pc_game_listii3qu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sovewegupafipiw.rf.gd/84156092787.pdfIn PDF document text
    • http://bokubipojofoji.rf.gd/word_shapes_worksheets_free.pdfIn PDF document text
    • http://sidepojedava.myartsonline.com/business_vocabulary_in_use_intermediate_book.pdfIn PDF document text
    • http://gubowejuxenixu.rf.gd/wekabipo.pdfIn PDF document text
    • http://sozanizitug.epizy.com/37818926970.pdfIn PDF document text
    • http://wabupotobexuxu.epizy.com/blue_cross_of_florida_prior_authorization_form.pdfIn PDF document text
    • http://badisaxutut.rf.gd/wuliverex.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_off0000cc44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC44 5620 bytes
SHA-256: 310d68e4b045b55af3c5a93fa80047a63700411d580ecd79ab5d29f957796dff
font_01_sfnt_off0000df38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF38 10448 bytes
SHA-256: f199182e317337197a45dc5c2b073c7c9be82627ff39cd1527b055cc1821a764