Malicious PDF — malware analysis report

Static analysis result for SHA-256 31b5208a87c37008…

MALICIOUS

PDF

70.2 KB Created: 2021-03-29 15:01:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 77fbee58ff045840edf4d882b9f30b8a SHA-1: 1c986014477f68990268b332aa9f5d63e58f4660 SHA-256: 31b5208a87c370083d921ab04dd09533847d28bc7b4649764d694bfd70459631
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 0.9998

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://lozipotod.ru/wix?keyword=polaris+atv+owners+manual PDF link annotation
    • https://cdn.sqhk.co/kivipemo/CBzRJjj/4831920716.pdfIn PDF document text
    • https://cdn.sqhk.co/toralapiluw/hrjdjj8/6014128597.pdfIn PDF document text
    • https://cdn.sqhk.co/vobevufubito/igjd7ie/idle_construction_3d_apk_android_oyun_club.pdfIn PDF document text
    • https://cdn.sqhk.co/pananumujo/ljjcqjf/top_10_music_2020_rap.pdfIn PDF document text
    • https://cdn.sqhk.co/nadovexum/fPjjie8/39271934664.pdfIn PDF document text
    • http://vamekujo.66ghz.com/oci_application_form_australia.pdfIn PDF document text
    • https://cdn.sqhk.co/tajudozizif/ier0lOY/paypal_app_for_android_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/fagiseregu/ajdggRE/85387939879.pdfIn PDF document text
    • https://cdn.sqhk.co/manuguwe/lZlpunB/bhagat_singh_wallpaper_hd.pdfIn PDF document text
    • https://cdn.sqhk.co/xowuzaseku/IMzOijK/no_suena_kontakt_cubase.pdfIn PDF document text
    • http://gotesesevuzi.iblogger.org/reasons_to_stay_alive_sample.pdfIn PDF document text
    • http://xegevapu.iblogger.org/inductive_and_deductive_reasoning_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/modajili/gi1hbid/scentsy_catalog_2019.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://susixegan.rf.gd/riddles_with_answers_super_hard.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/dr_seuss_books_complete_set.pdfIn PDF document text
    • http://kodowemomi.rf.gd/capacitor_start_capacitor_run_motor_wiring_diagram.pdfIn PDF document text
    • http://mimiruwonaru.epizy.com/edexcel_a_level_psychology_textbook.pdfIn PDF document text
    • http://kojixaberi.rf.gd/tchibo_cafissimo_bedienungsanleitung.pdfIn PDF document text
    • http://novegiw.rf.gd/bumep.pdfIn PDF document text
    • https://s3.amazonaws.com/xewamejixolefaj/journey_to_the_west_movie_in_hindi.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_off0000d394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD394 4984 bytes
SHA-256: fed2551d531281631be2f1edea4efd3247eb858f26691abb6c268936f9de2f9f
font_01_sfnt_off0000e483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE483 11132 bytes
SHA-256: 5c2f65cf3a28fe90d1988e42a5ed745e113fc212585999b61edaa91dcbb1c97e