Malicious PDF — malware analysis report

Static analysis result for SHA-256 67b7b07ddc765b55…

MALICIOUS

PDF

80.4 KB Created: 2021-04-03 00:49:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 2b0278283582da3ccf31b0428ed24e3f SHA-1: 255e09e4213fcdfc0c4350fb06c10bab1bedeb73 SHA-256: 67b7b07ddc765b55a38935efbfd950834767ac2d420353db6024497933042d14
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file is identified as malicious by ClamAV and an ML classifier, and contains numerous external URIs. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm on disposable hosting, likely to redirect users to malicious sites. The document body, though partially corrupted, suggests a lure related to 'Simplehuman tension pole shower caddy instructions'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://leonvi.ru/strik?utm_term=simplehuman+tension+pole+shower+caddy+instructions PDF link annotation
    • http://wajazenizur.mywebcommunity.org/2012_honda_pilot_owners_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/wekaradukuve/VW4kQgc/at_t_mobile_security_plus_for_unlimited_plans.pdfIn PDF document text
    • http://zakosemej.mypressonline.com/similes_and_metaphors_worksheets.pdfIn PDF document text
    • https://cdn.sqhk.co/genopeno/ctmZjfP/skater_skirt_outfits_for_night_out.pdfIn PDF document text
    • https://cdn.sqhk.co/dewufidabo/Mhhfiit/meaning_of_amazed_in_urdu_and_english.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483104/normal_600ba0ea9e96b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419001/normal_5fe02be1c5083.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486201/normal_604fb03321cab.pdfIn PDF document text
    • https://cdn.sqhk.co/wetaxawirewu/OigQN4T/direct_line_additional_driver.pdfIn PDF document text
    • http://fafijitesulexiz.mygamesonline.org/finanzas_bursatiles_libros.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446492/normal_5fdba62edb758.pdfIn PDF document text
    • https://cdn.sqhk.co/radofufalam/ubiahhg/elemental_dungeon_mod_apk_money.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420745/normal_6025010c717b9.pdfIn PDF document text
    • https://cdn.sqhk.co/kupawusel/3jhqQwt/50865854610.pdfIn PDF document text
    • https://cdn.sqhk.co/xoradofexul/hifzgfs/chemical_element_symbol_table.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zuputes.atwebpages.com/22694331273.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afb32414-64cf-4a9f-af3c-594db1fe2a56/mcgraw_hill_connect_student_registration.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc473f6f-e03d-464e-b424-63500b7a6643/can_you_mix_cement_in_cold_weather.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2c8e1f2-8fa0-4041-ac2e-3284d777b4b4/baxobediwodoripo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f13e28e4-c3ba-40e5-926b-c2a48d14a4c6/who_guidelines_for_baby_food.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/686ac662-f6cb-4a0e-9fc9-959c3027f38b/kutixegitovegej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cacc79fa-63b9-4944-b52b-6613a9e255d2/80447968692.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1210719-93c5-4ad8-b2a9-efe4ceca5901/1930_um_marco_na_histria_do_brasil_resumo_brainly.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_off0000fbcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCD 5608 bytes
SHA-256: 63907e55fca9cf7102f8a033183e52f54d0db63fda3dd1d0cd77c10592eade07
font_01_sfnt_off00010ec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC8 11056 bytes
SHA-256: 16f6e845fcf954ace2634675ba32828c4e7fd7c4e0fce4d6c22a9e721b51ef97