Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d54d6c0284bed71…

MALICIOUS

PDF

82.0 KB Created: 2021-04-01 00:22:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c6dd8f6a9c5ba8b1b9e3efdd776eaab0 SHA-1: 9024350e9af863a438eb7068d0fd8ecea4118fb5 SHA-256: 0d54d6c0284bed7126255b5ea9b3235962782c72337053c57803624e2d0de9f6
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://nipisod.ru/wix?keyword=website+evaluation+worksheet+answers PDF link annotation
    • https://mumimobubaw.weebly.com/uploads/1/3/4/6/134640569/napotixof.pdfIn PDF document text
    • https://cdn.sqhk.co/sugezigo/g6ACjdu/bobupizupulukemeri.pdfIn PDF document text
    • https://cdn.sqhk.co/nolagutotato/2giyojf/ultimate_3d_classics_car_rally_mod_apk_rexdl.pdfIn PDF document text
    • https://cdn.sqhk.co/kinemefuwa/HiemhcI/xurafuzozurolob.pdfIn PDF document text
    • https://cdn.sqhk.co/xorunase/gchaMCu/stick_cricket_live_mod_apk_android_1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410703/normal_601b27cb252d3.pdfIn PDF document text
    • https://bilokomomaxin.weebly.com/uploads/1/3/5/3/135397692/8507863.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisidumes/5VK8hiZ/pics_word_game_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368958/normal_6063d5c7eacf6.pdfIn PDF document text
    • https://cdn.sqhk.co/nepusoliweda/jjjPZie/3698796992.pdfIn PDF document text
    • https://wipukanutunuk.weebly.com/uploads/1/3/1/4/131437017/5839527.pdfIn PDF document text
    • https://xarupome.weebly.com/uploads/1/3/4/4/134469096/9943887.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414352/normal_5ff828faace03.pdfIn PDF document text
    • https://cdn.sqhk.co/vijamabaf/hicPFQ4/99536050102.pdfIn PDF document text
    • https://cdn.sqhk.co/xebosulog/wjdicW4/rexroth_hydraulic_calculations.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4506131/normal_6033008e835a6.pdfIn PDF document text
    • https://cdn.sqhk.co/kogujipubap/pjg6hhF/police_officer_costume_accessories_women_s.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vunizi/luraselidabowutume.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/heath_zenith_motion_sensor_light_installation.pdfIn PDF document text
    • http://puwekaxaxowiza.epizy.com/vpn_for_pc_nord.pdfIn PDF document text
    • http://jomewudixaf.epizy.com/android_assets_directory_path.pdfIn PDF document text
    • https://s3.amazonaws.com/pavujiniz/how_to_record_airtel_dth.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/internet_safety_worksheets_ks2.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_off000102f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F2 5140 bytes
SHA-256: 852380ffd1a070697dab5faabd0dbcba173cd856fae7a1b1a7f8614e08a9cda4
font_01_sfnt_off00011481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11481 10624 bytes
SHA-256: 749931f8bee04aff32fd354a7059bb1b4651babad61a8921ab93b147daa53957