Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f42db13f0bab5dc…

MALICIOUS

PDF

81.2 KB Created: 2021-03-16 04:09:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 095a48e20f640f97f2d6dd96f924d99f SHA-1: 1ba52320618494e9c7fbcfaa216af8511cb7a54a SHA-256: 9f42db13f0bab5dc7d0e1b3cf1a5305620be94995f1063e6060785df6ee7dace
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one pointing to a suspicious domain ('golowaki.ru') that is flagged as external. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm on disposable hosting, suggesting a malicious intent to redirect users. ClamAV also detected this file as 'Pdf.Phishing.Trojan'.

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://golowaki.ru/strik?utm_term=magic+chef+mini+fridge+hvdr450se+parts PDF link annotation
    • http://garant-ritual.online/jusoxitisewatokujelijandwf4c.pdfIn PDF document text
    • http://tazotirivixo.22web.org/tao_tao_49cc_scooter_review.pdfIn PDF document text
    • http://lnstagramcopyrighthelps.com/lagu_free_iphonenz70x.pdfIn PDF document text
    • http://mixed-rootwork.com/41764599686on4uz.pdfIn PDF document text
    • http://teksalle.xyz/can_you_do_the_10_day_green_smoothie_cleanse_while_breastfeedingi126j.pdfIn PDF document text
    • http://creampiepow.club/zafawedidutirizz0n9.pdfIn PDF document text
    • http://profibrend.ru/57202985586y0z4t.pdfIn PDF document text
    • http://lynciguest.com/el_coronel_no_tiene_quien_le_escriba_teatro_infanta_isabeljam9w.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/fadupazageraf/mount_everest_images_hd.pdfIn PDF document text
    • http://kegipufi.rf.gd/stack_ball_abrete_paso_a_golpes_apk.pdfIn PDF document text
    • http://lamafuravufezin.epizy.com/32905599936.pdfIn PDF document text
    • http://lexafuz.epizy.com/22956737586.pdfIn PDF document text
    • http://kopuperoki.epizy.com/32233213873.pdfIn PDF document text
    • https://s3.amazonaws.com/xezonijida/buwabubozivaxuvoruza.pdfIn PDF document text
    • http://luvigewe.rf.gd/77801000621.pdfIn PDF document text
    • https://s3.amazonaws.com/sagotomagin/marathi_movie_whatsapp_status_video_free.pdfIn PDF document text
    • http://gonesipida.epizy.com/63867030036.pdfIn PDF document text
    • http://dabazageneve.rf.gd/12616492286.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_off0000fef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF9 5956 bytes
SHA-256: 8ea4a50352fcdaee6f30584dee2a26de6d2de4e31e22bb3d9a581bf060f10cf7
font_01_sfnt_off00011338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11338 10532 bytes
SHA-256: 082ebb360140c7dbeddfff07eef7affd828997c8be5f134ab36951007106379c