Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1b0a9cbe1056047…

MALICIOUS

PDF

126.0 KB Created: 2021-03-18 07:06:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7fa58730089c5813631ace96c06c4405 SHA-1: 2e142baeb8de12ec25a703930bfe45e23498b73c SHA-256: a1b0a9cbe1056047a16162a0fe09b5b8d2fb25617fd2c917054a491c298a9a78
184 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics, including a critical alert for malicious redirector links and a high ML score. The embedded links, such as 'https://crophysi.ru/strik?utm_term=how+to+connect+hp+deskjet+to+macbook', are designed to redirect users to potentially harmful websites. The document body, though partially corrupted, contains text related to connecting devices, likely a lure to disguise the malicious intent of the embedded links.

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
  • 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+to+connect+hp+deskjet+to+macbook In PDF document text
    • https://cdn.sqhk.co/vozofugova/z2icGYo/waves_tune_real_time_vs_logic_pro_x.pdfIn PDF document text
    • http://worozoxiw.sportsontheweb.net/platero_y_yo_resumen_rincon_del_vago.pdfIn PDF document text
    • https://cdn.sqhk.co/pulazapusaw/veegft7/when_will_cruise_ships_sail_in_europe.pdfIn PDF document text
    • http://gagitevanonuti.mywebcommunity.org/thon_case_kemper_profiler_stage.pdfIn PDF document text
    • http://tiwimifozukimu.medianewsonline.com/flight_of_ideas_vs_knights_move.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411219/normal_5ff9a42116400.pdfIn PDF document text
    • https://cdn.sqhk.co/kolokejo/jjji9gi/39380977021.pdfIn PDF document text
    • http://bebetadiruj.mywebcommunity.org/98659742590.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448746/normal_602266e9e31ab.pdfIn PDF document text
    • https://cdn.sqhk.co/potiribuwuf/jfiguep/4_pics_1_word_level_2286.pdfIn PDF document text
    • https://cdn.sqhk.co/nokotadi/iegihbv/friend_finder_iphone_7.pdfIn PDF document text
    • http://vazifesi.iblogger.org/78235780441.pdfIn PDF document text
    • https://cdn.sqhk.co/bitizulokiva/jj7idmS/dual_universe_review.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446289/normal_60381cf40cbff.pdfIn PDF document text
    • https://cdn.sqhk.co/zesonixiv/idiAij4/virus_war_app_game.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://16e729f2-8c5c-4787-b670-14aeba6c5e03.filesusr.com/ugd/ac55e2_1a8241d69cac404aae490b7962410fd7.pdf?index=trueIn PDF document text
    • http://vaveboxalubani.rf.gd/are_betty_crocker_brownies_dairy_free.pdfIn PDF document text
    • http://zajupulavofawi.myartsonline.com/convert_to_word_document_zamzar.pdfIn PDF document text
    • http://kobizesamow.rf.gd/best_comptia_it_fundamentals_study_guide.pdfIn PDF document text
    • https://aa4c2489-c93b-4667-afab-104bf5323bad.filesusr.com/ugd/8b49c6_32ce5aa96f414ee79f876b8064f7704d.pdf?index=trueIn PDF document text
    • https://580b68e3-2104-4118-ae5b-4f285de1c062.filesusr.com/ugd/dad7b5_d9a5cd62b785421aa87694393c73c3f3.pdf?index=trueIn PDF document text
    • https://a5a7f18c-b887-48a0-80cc-3627c14345d5.filesusr.com/ugd/609f59_88ba7f6ae6b54a968ebcc8d54b443d1c.pdf?index=trueIn 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_off0001b0d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B0D6 5516 bytes
SHA-256: fd38601582275e51f2d2ead6f59f95baedbbaddd4bb4afa0d9ff72b2ccc75a5e
font_01_sfnt_off0001c37e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C37E 12408 bytes
SHA-256: ee9c1fe04ea6be3c7a33130ce2690001c22475ec8877d8f3d5c51e2b0133b939