Malicious PDF — malware analysis report

Static analysis result for SHA-256 c85acb3fa10fcd8c…

MALICIOUS

PDF

79.5 KB Created: 2021-04-06 10:05:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 139558f228a76f6b1f3ba04c87651d3f SHA-1: 99618e1005b43eed64877791dac5fd7b2ee42ba0 SHA-256: c85acb3fa10fcd8c2ff52370dccabdbc88aa2870f7012a0c0399948f404acc42
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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-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://botokaw.ru/aws?utm_term=map+of+europe+before+and+after+ww1+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465263/normal_60660af39e188.pdfIn PDF document text
    • http://redirunna.xyz/nj_driver_license_document_numberps965.pdfIn PDF document text
    • http://kvrovk.xyz/47208488162tzq5e.pdfIn PDF document text
    • https://cdn.sqhk.co/mewedenemez/jdhchkz/3429961207.pdfIn PDF document text
    • https://cdn.sqhk.co/dowusutitozi/jeBONl5/bird_feeder_plans_for_cardinals.pdfIn PDF document text
    • http://deutschebank-meine.com/tupakerogevj27y4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416510/normal_5fc5991a61c63.pdfIn PDF document text
    • http://vizionsmc.net/how_do_i_connect_my_phone_to_my_kyocera_printergr7if.pdfIn PDF document text
    • http://auto-fishing-rods1.club/les_adjectifs_possessifs_worksheet595dl.pdfIn PDF document text
    • https://cdn.sqhk.co/nezerozara/gghfYhc/easy_pay_login.pdfIn PDF document text
    • https://cdn.sqhk.co/wazilisiko/heibefZ/running_lion_gif_animated.pdfIn PDF document text
    • https://cdn.sqhk.co/navififoro/EtLBjen/my_lg_android_won_t_turn_on.pdfIn PDF document text
    • https://cdn.sqhk.co/fomeluxilim/CZgdibD/tunnel_hull_race_boat_for_sale.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452386/normal_60349bceaf066.pdfIn PDF document text
    • https://cdn.sqhk.co/logubaxe/jiGurgi/20522922493.pdfIn PDF document text
    • https://cdn.sqhk.co/wujozuzewed/heickhb/40448079477.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/sesijesule/fagefovirefageza.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/monopoly_game_rules_buying_houses.pdfIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/42362331165.pdfIn PDF document text
    • https://s3.amazonaws.com/bejeseja/unqualified_steven_furtick_epub.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_off0000f9d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D2 5448 bytes
SHA-256: dddefa493ea67f5baf49ac673c266a8e1442cf4a6731e7ca0277381805a381dd
font_01_sfnt_off00010c79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C79 10640 bytes
SHA-256: 1f9efe296c55c9fe1f474096a727bc0dd072105093ab745bd471f91f624a7a66

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