Malicious PDF — malware analysis report

Static analysis result for SHA-256 38fd260d687b13f0…

MALICIOUS

PDF

76.9 KB Created: 2021-03-06 23:07:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b6d9e3ff67d9a198628565444dd2e158 SHA-1: a6e1bd4efb9160e68dd9f804c2880931363c35f0 SHA-256: 38fd260d687b13f0480b5dd911716e629a9be6e9f67ed32e0019059d7c79a254
134 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://resalured.ru/strik?utm_term=6x9+speakers+template PDF link annotation
    • https://cdn.sqhk.co/vedasukuki/jeJijie/givifulejuwijatavu.pdfIn PDF document text
    • https://cdn.sqhk.co/pigexebobe/aRNFgqK/boat_wallpapers_best_4k_uhd.pdfIn PDF document text
    • https://cdn.sqhk.co/sukonazukuv/iaqUqz5/solar_system_planets_and_moons.pdfIn PDF document text
    • https://cdn.sqhk.co/segexiji/IidJjgR/space_shooter_unity_3d_tutorial.pdfIn PDF document text
    • http://jalakerag.22web.org/kenmore_elite_vacuum_cleaner_filters.pdfIn PDF document text
    • https://cdn.sqhk.co/lolajelor/GAgerJM/fast_and_furious_mobile_wallpaper.pdfIn PDF document text
    • http://lajodibibodi.getenjoyment.net/bipusisonaraloregepudi.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/iblichd/tuxebabewejadi.pdfIn PDF document text
    • https://cdn.sqhk.co/gogojelawov/icHjahh/21068275957.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rujidafedisezu.atwebpages.com/how_to_estimate_the_quantities_and_cost_of_building_materials_for_house_construction.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a39b3a0-bb9f-4379-8a5e-261382734ca1/xaravolewarakebex.pdfIn PDF document text
    • http://kuwijiti.myartsonline.com/15768326342.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f89a44ec-6152-4ff4-a426-baec2dcee0e3/what_is_sdlc_understand_the_software_development_life_cycle.pdfIn PDF document text
    • http://lupixopuvir.onlinewebshop.net/48321105514.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7bf14f1-e006-4c98-a3b1-8dbd3e870d6c/jvc_camcorder_charger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aed26c76-1e56-4b74-9fdc-da91fc4c5b5d/baby_trend_flex_loc_infant_car_seat_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8287c791-462f-427e-b138-b11c2c8c9fc1/61995992458.pdfIn PDF document text
    • http://votitagupen.epizy.com/www_mediafre_com_file_minecraft_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_off0000d472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD472 5312 bytes
SHA-256: 39bb37754d9e1a3fda86370d57f0bee04f89c7835f8d536931848a0535f96c07
font_01_sfnt_off0000e669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE669 12324 bytes
SHA-256: d83fdd95ddb36a64f077a79007c826f89ed26be0dd27170cc4f9db2dd7c05859
font_02_sfnt_off0001105f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105F 16320 bytes
SHA-256: b08bd4e479facf407e4830f52c89ad93f7f9c17c54afe73ea3793ff036245db9