Malicious PDF — malware analysis report

Static analysis result for SHA-256 85d4cf12d945da0a…

MALICIOUS

PDF

92.3 KB Created: 2021-03-17 00:25:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 026f572c944907b3a2a206ba012d0f28 SHA-1: b4daf412115a2aecb622f8c913d33380f7e3fce6 SHA-256: 85d4cf12d945da0a88088c30fdd1faaab21753b6f1d74003bea919ccd8e2b634
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with several pointing to known malicious redirectors and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, but the presence of links and the heuristic firings confirm the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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/123?utm_term=bonded+labour+act+pdf In PDF document text
    • http://vifijes.22web.org/2004_chrysler_pacifica_engine_removal.pdfIn PDF document text
    • https://cdn.sqhk.co/xavaxonad/E8ijjfC/abyssrium_world_tap_tap_fish_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/devisofage/y1nS2he/sas_urban_survival_app.pdfIn PDF document text
    • http://tazikuruwuwozu.22web.org/weather_report_today_live_news.pdfIn PDF document text
    • http://xupelomepole.22web.org/63801670512.pdfIn PDF document text
    • http://kawonipedo.22web.org/how_much_is_the_dyson_stick_vacuum_at_costco.pdfIn PDF document text
    • https://cdn.sqhk.co/didirepakavi/eYC2gjH/77699338080.pdfIn PDF document text
    • https://cdn.sqhk.co/riteximeras/j7jbHgj/dixie_d_amelio_song_lyrics_be_happy.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
    • https://uploads.strikinglycdn.com/files/ef931820-3b50-47e8-8f78-ee9d86983220/amsco_us_history_chapter_12.pdfIn PDF document text
    • https://s3.amazonaws.com/gogoxowiniza/gefukavomopexe.pdfIn PDF document text
    • http://manosotidokef.myartsonline.com/how_to_write_a_response_paper_for_philosophy.pdfIn PDF document text
    • http://rowabereduxafu.epizy.com/casualty_tv_series_episode_guide.pdfIn PDF document text
    • http://zabusokaruzovi.rf.gd/orbit_sprinkler_timer_fuse_replacement.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/argus_brick_camera_manual.pdfIn PDF document text
    • http://xifedesekelogu.epizy.com/9669590880.pdfIn PDF document text
    • http://xifabopopotesa.epizy.com/bibliography_format_for_physics_project.pdfIn PDF document text
    • http://kitomov.epizy.com/ada_guideline_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cb132ef-742e-4c9b-b629-2652944258b1/62165502270.pdfIn PDF document text
    • https://s3.amazonaws.com/xirixepo/archery_master_3d_hack_apk_revdl.pdfIn PDF document text
    • https://s3.amazonaws.com/zoxewudunigus/16031940657.pdfIn PDF document text
    • http://xonolori.atwebpages.com/xagodana.pdfIn PDF document text
    • http://bapiwixobenilax.rf.gd/cetoacidosis_diabetica_y_estado_hiperosmolar_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39f08064-6c6e-4211-a487-22c98bac537f/zarexoti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a4d5596-9c55-4e31-939e-a6d075c5bc9a/lojepoxijojerukaxavewes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ba5a846-2795-4c80-93ac-5f9159314f34/42135153859.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C04 4996 bytes
SHA-256: efe894fb83e035427ce84d9832665e60f4df323f57e8bc76aeced9d386ca6444
font_01_sfnt_off00011d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D06 10364 bytes
SHA-256: 5bdae965939e7d54dc5a248318bab11f4fe85a07483995c17e16bf2ebdec25bd
font_02_sfnt_off000140b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140B2 16060 bytes
SHA-256: 2173a1880e9f774f759393e7d0d28dda91d04d8a3eae6bea41b822770b343b90
font_03_sfnt_off00015549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15549 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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