Malicious PDF — malware analysis report

Static analysis result for SHA-256 9186779e8dd03cbd…

MALICIOUS

PDF

97.7 KB Created: 2021-05-21 12:21:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: acc639b4005834146414fd349e1bc68a SHA-1: 94ddff1f835c754c1452aaf18da7a80a82cc4b35 SHA-256: 9186779e8dd03cbda7e0424dc64e2d553cbf56737ed8c4fa4a4cb37a2257a7fe
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 0.9995

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://seumenha.ru/strik?utm_term=gameboy+advance+emulator+online+unblocked PDF link annotation
    • https://farunekigevizaj.weebly.com/uploads/1/3/5/9/135976182/7a804108a0.pdfIn PDF document text
    • https://velalozelo.weebly.com/uploads/1/3/4/4/134498802/botuk.pdfIn PDF document text
    • https://votarozoxanobo.weebly.com/uploads/1/3/4/3/134315144/1518217.pdfIn PDF document text
    • https://sotinele.weebly.com/uploads/1/3/4/6/134640455/acf2c1ba9f417d6.pdfIn PDF document text
    • https://wenewemegidipep.weebly.com/uploads/1/3/4/6/134679414/3865552.pdfIn PDF document text
    • https://pomulopegodetom.weebly.com/uploads/1/3/1/3/131384256/3181341.pdfIn PDF document text
    • https://jewukezi.weebly.com/uploads/1/3/0/9/130970006/notajuriv.pdfIn PDF document text
    • https://zufunukilaje.weebly.com/uploads/1/3/4/8/134888690/202917.pdfIn PDF document text
    • https://vopupina.weebly.com/uploads/1/3/1/0/131070761/pelarefetadajis_zadilewevulas.pdfIn PDF document text
    • https://xokefazekuli.weebly.com/uploads/1/3/5/9/135992394/3835718.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/328ea648-56e3-43c5-b929-b6efae4ff418/6376451106.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31120ee2-2f42-48c3-8e6b-7dfd541257c1/how_to_calculate_flow_rate_with_pipe_size_and_pressure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7bde873-eafd-40be-9be3-dbc674d4a2b5/brother_hl-3170cdw_drum_unit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/173b9fe3-e93d-4b6e-a302-613b06af5293/welegesinibovax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e17a911-0f37-4b76-afc1-b11773b016f8/clark_c500-55_forklift_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66d803a3-b955-480e-866d-8960c609e0c2/rejogaxatali.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/516786d8-0dfa-42da-aafa-da002609178c/what_are_the_major_characteristics_of_romantic_poetry.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9c9c16a-50d9-4079-b383-b5b3a2ea6436/dantes_inferno_game_bosses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7799c8cd-e3c4-461a-820a-de28f7fd80e3/36459726996.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47d916f8-736c-4ea6-984f-890d373496fa/is_rigid_as_good_as_dewalt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5774cbb3-6bfb-494d-a7ed-b20ba37e0b7d/what_does_rideshare_mean.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012e17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E17 5184 bytes
SHA-256: 9d338a48475c080564735eaa45e0352e251fc0c42216e7fe288088c604f95e96
font_01_sfnt_off00013fb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FB4 13416 bytes
SHA-256: 40258443bfeed6c36d200b8958e3601309d9622fcdb45237696f009e371b7645
font_02_sfnt_off00016b35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B35 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378