Malicious PDF — malware analysis report

Static analysis result for SHA-256 36bee786893339be…

MALICIOUS

PDF

94.0 KB Created: 2021-03-17 00:27:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: fea482b239939da5fc14e33a93cab3cc SHA-1: eaaeb8ab863c4fefc8d00c31cee503a1fb97d052 SHA-256: 36bee786893339beab0fd4e293cd4f4737719808821739572f48fa064748e3c4
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The presence of a URL with a 'tradesman apply form' query parameter, combined with the ClamAV detection and ML classifier flagging it as malicious, indicates a phishing or malicious redirection attempt. No scripts were extracted, but the PDF structure itself is used to host and present these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://vilenefex.ru/123?utm_term=bsf+tradesman+apply+form+2019 PDF link annotation
    • https://cdn.sqhk.co/tisufupujeli/Qgc7d5s/free_read_along_books_for_first_graders.pdfIn PDF document text
    • https://cdn.sqhk.co/govovazeket/ihN53gj/bhojpuri_video_songs_free_kalpana.pdfIn PDF document text
    • http://lastmarkt.ru/double_bass_drum_exercises_for_beginners8q2eq.pdfIn PDF document text
    • https://cdn.sqhk.co/surodamiz/hk6hemy/fazusoxuwa.pdfIn PDF document text
    • http://masterpowerpoint.com/assetto_corsa_night_mod70p2j.pdfIn PDF document text
    • http://gilumesu.mypressonline.com/wawimezatosupataku.pdfIn PDF document text
    • http://xilatotes.sportsontheweb.net/brother_mfc-7340_printer_driver_for_windows_7.pdfIn PDF document text
    • https://cdn.sqhk.co/gisusisabez/jeRhdhf/92237733869.pdfIn PDF document text
    • http://doordash.fun/talking_tom_gold_run_hack_apk_free_download7j273.pdfIn PDF document text
    • https://cdn.sqhk.co/dagozuwemep/1jh3jah/95949311330.pdfIn PDF document text
    • http://pivojowemetobiv.mywebcommunity.org/7392132266.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://radiviwix.onlinewebshop.net/t_sql_tutorial_free_download.pdfIn PDF document text
    • http://nejarisiwudu.atwebpages.com/dan_brown_inferno_review_book.pdfIn PDF document text
    • https://fa886832-b9e3-4ce5-a98c-97da2614721f.filesusr.com/ugd/9f8050_efe8644b4f8b47a5b8cc325e9d1f4814.pdf?index=trueIn PDF document text
    • http://tuwutexo.onlinewebshop.net/wamisu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af77cc58-6c69-4352-8a76-07abc01d50fd/taco_bell_healthy_menu_items.pdfIn PDF document text
    • https://6fd4412c-3e6e-4f21-a9af-8137ffc6c0d9.filesusr.com/ugd/03469c_3210a397a65b4291b67a5423825c7aeb.pdf?index=trueIn PDF document text
    • http://tevefetilojas.atwebpages.com/2000_7.3_powerstroke_fuel_bowl_rebuild_kit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2c177e3-af2e-44e5-824c-b3e0a0c22482/icharger_206b_firmware.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bafad626-41b9-4b14-b295-cd9d6a277a11/44036367804.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_off0000fe71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE71 5820 bytes
SHA-256: 208ca05187b20b388eaeee3f92228b5fe68e09df166b8ad5f8d01389d24a94e6
font_01_sfnt_off0001123c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123C 11564 bytes
SHA-256: 91efb613eb3cc768ed1b844395a0c53fbb8be0380b0ff2b4eaf2a5816080689d
font_02_sfnt_off000139e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139E6 16096 bytes
SHA-256: 61761e6c71fdd980502ce8a3a8cbf9590216241eb9eabe72fdf309a1c23cd3c2
font_03_sfnt_off00014eeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EEB 8128 bytes
SHA-256: ed068d86d0dedb17ecb4b0c1899bfb6b7b475fa21341bb1917aaa642869c1a86