Malicious PDF — malware analysis report

Static analysis result for SHA-256 8267f299e6698679…

MALICIOUS

PDF

83.4 KB Created: 2021-03-10 21:02:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ae48631c264e2066c2402fc5dab095bf SHA-1: ba68359c2f10b06891ea35a77bd6c2cb4a38656e SHA-256: 8267f299e66986798d4c5cc266df5e4c85d3a5645990cce1eb38f75acd8441b7
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified by heuristics as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://baarspo.ru/award?keyword=trumpet+solo+from+symphony+no.+5+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4482009/normal_5fed9b5224e92.pdfIn PDF document text
    • http://wevesapawuzu.22web.org/warwick_building_control_application_form.pdfIn PDF document text
    • https://cdn.sqhk.co/runudori/j5jCgie/58161687717.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372696/normal_600f1a9f4b219.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477137/normal_602e1a0c8d682.pdfIn PDF document text
    • http://saxobupazes.sportsontheweb.net/zaxovuzopolirodas.pdfIn PDF document text
    • https://cdn.sqhk.co/novitovikor/zeUPyhh/tafheem_ul_quran_malayalam_software_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380887/normal_600552c9db833.pdfIn PDF document text
    • http://waxukapotaxakid.iblogger.org/5078118158.pdfIn PDF document text
    • https://cdn.sqhk.co/mogowepuw/PgcUjh1/58318457463.pdfIn PDF document text
    • https://cdn.sqhk.co/durotula/fhhTBEc/download_aplikasi_crazy_for_speed_2_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460476/normal_5feea7bd65116.pdfIn PDF document text
    • http://digosige.mywebcommunity.org/qcy_qy8_bluetooth_headphones.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/a01f8bef-c396-447e-a24c-2c9c38d6de04/jadiwemekitirekepiwu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9251489-126b-47a2-818c-4dfb98eb7e9f/how_to_work_a_singer_promise_sewing_machine_heavy_duty.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88806da1-df72-490c-bf44-65471229c4f5/sat_subject_test_khan_academy.pdfIn PDF document text
    • http://vozefure.rf.gd/namegotelojakusiledeximev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5910154e-c3b3-46cb-a6e4-a6ea6fdf19d5/pedari.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/081fb17e-dbab-4d7b-a91c-53df5d399863/73794214587.pdfIn PDF document text
    • http://radumepetunonif.rf.gd/how_long_does_it_take_to_get_a_divorce_certificate_in_south_africa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09943449-9ac4-48a4-8e04-cf8e1eb8edc2/2003_ford_focus_engine_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a59b741-2761-4e28-9558-f163d5a6b153/best_free_switch_games_2021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12570239-15fb-49d3-8cfc-afef764f3fbf/how_to_silence_a_frigidaire_microwave.pdfIn PDF document text
    • http://buzawasilugije.epizy.com/source_sans_pro_semibold_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF420 5276 bytes
SHA-256: 6de6ca6861f7b6c8ef7848c71022ec0c95795f7ce232fd4d971908b2fcffa352
font_01_sfnt_off000105f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F9 10648 bytes
SHA-256: afff990cffe8ca14e7262bb961a473a2878ed9f2a7437825c5ee77b7226c85fc
font_02_sfnt_off00012ab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB1 16120 bytes
SHA-256: 184efd0e138a9418359f6897f9ac56b5cd93cafbd57abf30711ac2aee7e18832