Malicious PDF — malware analysis report

Static analysis result for SHA-256 901ff8cd1126387c…

MALICIOUS

PDF

78.8 KB Created: 2021-04-16 07:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f877c556ffbabad81e535e81e89d6ad6 SHA-1: f802773b4a2bcf53b6e21b13e011a4c44cba07ae SHA-256: 901ff8cd1126387ce50e2dc5ade89e8d8d3abfd44e2cb09c6357e27fd510295e
184 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with at least one pointing to a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains strings related to weight loss and entertainment, suggesting a lure to trick users into clicking the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=how+much+weight+should+i+lose+4+months+after+gastric+sleeve In PDF document text
    • https://cdn.sqhk.co/rajunakeb/1AbEsOt/crash_team_racing_best_cars.pdfIn PDF document text
    • https://cdn.sqhk.co/sozimelizak/Oajjhgr/piganipifumidirukivedilot.pdfIn PDF document text
    • http://esplus.pro/kung_fury_2015okneb.pdfIn PDF document text
    • http://tizezs.xyz/role_of_medical_social_worker_in_community_healthbj4il.pdfIn PDF document text
    • https://cdn.sqhk.co/sulojumi/iajie58/pigetojoxiwanadabizol.pdfIn PDF document text
    • https://cdn.sqhk.co/foroboreb/hcxr8oX/english_stories_to_read_for_beginners.pdfIn PDF document text
    • http://powerpoint4you.ru/apc_smart_ups_rt_1500_xl_battery_replacement8q768.pdfIn PDF document text
    • https://cdn.sqhk.co/dodipenameki/bhiieMp/humans_vs_zombies_movie_trailer.pdfIn PDF document text
    • https://cdn.sqhk.co/vakanaju/gcgfjiq/vr_e_voce_consulta_rapida.pdfIn PDF document text
    • http://qwertyujg.xyz/74905453629s6ayz.pdfIn PDF document text
    • http://moscowflowers.shop/babikonuv9wk0x.pdfIn PDF document text
    • http://basvuruizleme.online/what_is_plot_structure_of_a_storypbt62.pdfIn PDF document text
    • https://cdn.sqhk.co/toledexipez/AgghcSn/luregetejoviwato.pdfIn PDF document text
    • http://usejus.pro/wofunimejilowj31n8.pdfIn PDF document text
    • https://cdn.sqhk.co/pibilebomek/mUjihbR/paypal_word_games_for_money.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/62ea958e-3f23-48c0-98fc-0a739d380a5c/96693826029.pdfIn PDF document text
    • https://s3.amazonaws.com/wutogugej/kukufi.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/images_of_nature_hd_wallpaper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac7e5dd1-4e9c-4d0e-ab04-335e359d47d1/what_is_colour_coding_for_straight_cable_and_cross_cable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7f86dcd-d8a5-4d6c-b362-8ab9f5c000ac/tetenofakenufunujofad.pdfIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/gudumisopasozekem.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/fajimozinaze.pdfIn PDF document text
    • https://s3.amazonaws.com/dakebesuvum/descargar_el_poder_de_la_palabra_hablada.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_off0000f4ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CE 5636 bytes
SHA-256: 4bb978b335706ac21c1b13b2bf9a8d59953e85a2ebfbcdcab70436f6d4e5fe35
font_01_sfnt_off000107ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EF 10912 bytes
SHA-256: dbc18f9017635ad92f4a1c3ef7af9ddaf60d113322cbcfe336d06fbada7745e4