Malicious PDF — malware analysis report

Static analysis result for SHA-256 cee33a489a6890ff…

MALICIOUS

PDF

89.8 KB Created: 2021-02-27 22:38:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 75b952aec77496f4405d555e3a98da5c SHA-1: 97c0b253fea5a7ca09e682d5377970139914f4db SHA-256: cee33a489a6890ff79b290872c03b91eaac8fb9cebfe11bc7f98d557a557ba3e
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://vilenefex.ru/aws?utm_term=how+to+thread+a+brother+ls+1520+sewing+machine PDF link annotation
    • https://cdn.sqhk.co/luwibajik/hbnMNiQ/wulazibilolud.pdfIn PDF document text
    • https://cdn.sqhk.co/jumivosokigo/ichdtKR/95039098852.pdfIn PDF document text
    • http://cmb-societe.com/my_not_so_perfect_life_audiobook_freewjf21.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxebiseso/jflifhb/save_the_girl_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzabajixiw/gvhfhgT/wopuluwagidewetirapezevi.pdfIn PDF document text
    • http://sewutaf.iblogger.org/kasizuturokuvalokejuluseb.pdfIn PDF document text
    • http://itwow.info/pixel_gun_3d_coin_hack_no_survey7vd3j.pdfIn PDF document text
    • http://on-arenas.com/15541210968i738b.pdfIn PDF document text
    • https://cdn.sqhk.co/panafilaputu/djfjgid/zara_home_locations_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/zuvaworizon/v6icgf7/rank_and_file_chess_board.pdfIn PDF document text
    • http://maselawave.22web.org/atrial_fibrillation_treatment_guidelines_2015.pdfIn PDF document text
    • http://8gusevshop.website/tedotudvs1oy.pdfIn PDF document text
    • https://cdn.sqhk.co/keximovib/dKHiil7/bakozatedekaxewesomevi.pdfIn PDF document text
    • https://cdn.sqhk.co/lukejisuvawe/hYhhha9/hover-_1_transport_electric_scooter_charger.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/dupula/django_imdb_parents_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bidurudilidujug/free_rap_albums_zip.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/bootstrap_html_form_select.pdfIn PDF document text
    • http://sopuvezek.rf.gd/97821753456.pdfIn PDF document text
    • http://gibagefozilot.epizy.com/regex_cheat_sheet_examples.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_off00011fcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCB 5996 bytes
SHA-256: 4ec776754dd13e848e3407d76a32ac4a7bec22146d0d72f075f79b48f893daaa
font_01_sfnt_off0001341f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1341F 11032 bytes
SHA-256: 8a9f594def280e2287afa0a4a7feb529009238c75d2cabf26a2353b57ca05b26

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