Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bac74c851fc8351…

MALICIOUS

PDF

76.4 KB Created: 2021-03-01 02:10:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 71aafc5644151c3fd77566256eaebf92 SHA-1: b0c4f0f17471b62f76ea4f0eabdd2334a7746035 SHA-256: 5bac74c851fc8351ee578829ec9900e593e04f95c900fcf50dc77d1b2d4456e3
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 0.9997

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://jacksth.ru/123?utm_term=sense+and+sensibility+movie+2008+trailer PDF link annotation
    • http://pemufosapakem.mypressonline.com/the_aeneid_robert_fitzgerald_online.pdfIn PDF document text
    • http://niburufajanuto.sportsontheweb.net/apex_40_lcd_tv_model_ld4088.pdfIn PDF document text
    • https://juwizezajofop.weebly.com/uploads/1/3/1/6/131637218/jamugi.pdfIn PDF document text
    • http://zajegipu.22web.org/gapotifuridaj.pdfIn PDF document text
    • https://zegilaritapedu.weebly.com/uploads/1/3/1/4/131438092/5214282.pdfIn PDF document text
    • http://pewodaz.22web.org/sumijumagikusi.pdfIn PDF document text
    • https://cdn.sqhk.co/mitugejaxel/ajjtjdU/jetonebavegowafij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sabofakulivibav.epizy.com/what_i_learned_in_reliable_sources_of_health_information_and_products.pdfIn PDF document text
    • http://pababevo.epizy.com/68253610838.pdfIn PDF document text
    • http://girigiroret.rf.gd/dogidam.pdfIn PDF document text
    • http://tafiwepamubov.atwebpages.com/1_what_are_the_4_phases_of_mitosis.pdfIn PDF document text
    • http://lekeladanipot.epizy.com/fanexedubimarututurebeda.pdfIn PDF document text
    • http://nezenomawaza.epizy.com/fishman_loudbox_mini_bluetooth_troubleshooting.pdfIn PDF document text
    • http://gafodix.myartsonline.com/enlightened_despot_definition_ap_world_history.pdfIn PDF document text
    • http://doruxexim.epizy.com/android_sqlite_begin_transaction.pdfIn PDF document text
    • http://miwodiseraxi.rf.gd/how_to_thread_a_brother_ls_2125_sewing_machine.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_off0000ead9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD9 5844 bytes
SHA-256: e8dae5ad2f020cbfb57ee15086c03095a67d5e39d4d51edfb70e5204b3b35e3e
font_01_sfnt_off0000feaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAA 11060 bytes
SHA-256: 5fa12980c46bddda02a3623c8c2199026c09653765e4c1e8e0cbe69740c32b1a