Malicious PDF — malware analysis report

Static analysis result for SHA-256 c972ccc37da1127d…

MALICIOUS

PDF

76.1 KB Created: 2021-04-04 13:43:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 4de917989a05e3a2afb5e0ae4049debc SHA-1: 085bb71eed5d937215a43a1b39c788238770b31a SHA-256: c972ccc37da1127d4290ed5be46b288bac0a9b88db31e4761a8a9c30ef362595
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, indicative of a link farm or SEO spamming technique. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs and the document's structure suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://pelibifir.ru/123?utm_term=case+study+handbook+william+ellet+pdf PDF link annotation
    • http://navewezaninub.iblogger.org/bullets_of_justice.pdfIn PDF document text
    • https://cdn.sqhk.co/togareguko/jhjjdt6/tabulibidobesokufirozopiv.pdfIn PDF document text
    • http://sunazeremitiwu.mypressonline.com/musculos_agonistas_y_antagonistas_del_cuerpo_humano.pdfIn PDF document text
    • https://cdn.sqhk.co/miropefaneka/iWRicie/online_compiler_for_html_and_php.pdfIn PDF document text
    • https://cdn.sqhk.co/lixepupo/jhXDKgc/palawesigize.pdfIn PDF document text
    • http://datinge.site/92390678737aqhtw.pdfIn PDF document text
    • https://cdn.sqhk.co/buzodafevuj/ijhcgiK/46908752539.pdfIn PDF document text
    • http://dakekunagefasak.sportsontheweb.net/75674811072.pdfIn PDF document text
    • http://tulutita.sportsontheweb.net/42166257615.pdfIn PDF document text
    • http://visiblawty.com/nordictrack_incline_trainer_x7i_partsm6gue.pdfIn PDF document text
    • https://cdn.sqhk.co/letiludixo/dhhTUha/entergy_ms_contact_number.pdfIn PDF document text
    • http://katorewudejizut.22web.org/airline_tycoon_deluxe_apk_revdl.pdfIn PDF document text
    • http://znakomstva18x.site/bissell_pet_hair_eraser_upright_vacuum_partsaj2dp.pdfIn PDF document text
    • http://julubavixukab.66ghz.com/can_you_buy_starbucks_mugs_online.pdfIn PDF document text
    • http://collegegraduatecentraldating.com/356835863553mszb.pdfIn PDF document text
    • http://presente-top.store/80149715182yw2on.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fazemiwasagi.epizy.com/avery_templates_labels_8160.pdfIn PDF document text
    • https://67dc9804-4028-4298-afd7-d431d2c16fe6.filesusr.com/ugd/559c84_987b46400434438ea8ae5e64765945d3.pdf?index=trueIn PDF document text
    • http://tarepos.onlinewebshop.net/electronics_engineering_book_free_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE99 5488 bytes
SHA-256: 7923cf0c551960e605aec526a3222fb0307a7e6aa88c054a17a6df3e8c0f7590
font_01_sfnt_off0000f127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF127 10604 bytes
SHA-256: fc90ab334f5243c6990b48b45def5c138a88257f90618e909ec7c8594031db1c
font_02_sfnt_off00011547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11547 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f