Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc3682e508948f8f…

MALICIOUS

PDF

86.2 KB Created: 2021-04-19 16:14:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7b15fe5079cd5326dd38443e3487e7a5 SHA-1: 717fe6b5a6da1e80fb8f396a910819e968460c22 SHA-256: cc3682e508948f8f1b4aae1fcba1ccf8a2b2e7ed62fb41af46f4b701a4aa50cb
126 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://bologen.ru/strik?utm_term=digital+signal+processing PDF link annotation
    • https://cdn.sqhk.co/suzeboxiwo/ghfic2K/wheelie_bike_game_record.pdfIn PDF document text
    • http://it50disconto.pro/ideas_para_decorar_la_corona_de_adviento1qfsf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415934/normal_6041da87b1347.pdfIn PDF document text
    • https://cdn.sqhk.co/norowitidot/hlhejas/sogajowunovudadotez.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420765/normal_6002445f51994.pdfIn PDF document text
    • https://cdn.sqhk.co/dufimogemeka/pJtChjK/como_recargar_claro_ecuador.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501054/normal_602285ef5d147.pdfIn PDF document text
    • http://lngcliente.com/lelexugujeditogom17f2b.pdfIn PDF document text
    • https://cdn.sqhk.co/nomitusibop/iaijZia/ac_rogue_legendary_ships_reward.pdfIn PDF document text
    • http://websporizle4.com/chopin_nocturne_c_sharp_minorzja6v.pdfIn PDF document text
    • https://cdn.sqhk.co/gogojelawov/0mdjcr9/judo_world_championships_2019_medal_table.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485156/normal_5fd2df0d300b8.pdfIn PDF document text
    • https://cdn.sqhk.co/sarafogu/Yjhigha/detusuroke.pdfIn PDF document text
    • http://scrlt.xyz/12116017855xwtea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367013/normal_603cadc5bbc64.pdfIn PDF document text
    • http://porn77.design/joy_to_the_world_ukulele_chords_key_of_c6ompq.pdfIn PDF document text
    • http://rufoferapavinew.medianewsonline.com/pagivigu.pdfIn PDF document text
    • https://cdn.sqhk.co/zawatilirip/ciixeih/car_simulator_games_for_pc_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://dubanexotokegel.myartsonline.com/bombay_high_court_shortlist_clerk_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5a53a98-44da-40cc-9f6f-df534472f62e/what_is_the_objective_of_fasting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03765b01-9dc4-4492-b7ae-39ce450265e2/8th_grade_social_studies_textbook_america_history_of_our_nation.pdfIn PDF document text
    • http://wiwosotu.myartsonline.com/xinilipi.pdfIn PDF document text
    • http://duxepivol.myartsonline.com/cours_sur_le_rapprochement_bancaire.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10746 4888 bytes
SHA-256: c2bc1b925f2c6e41ba080d81b5f20a94f82168227600b89f37a6d3e32add023f
font_01_sfnt_off000117ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117EA 10960 bytes
SHA-256: 5717d26fc97b2c43e753ce41a511806dbbda67c1fd2b6c4f106e2ad8f6b2905d
font_02_sfnt_off00013d61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D61 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3