Malicious PDF — malware analysis report

Static analysis result for SHA-256 620a793bd212103d…

MALICIOUS

PDF

77.3 KB Created: 2021-06-11 03:37:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c2bca6c89cbb3732a1eec79f98bf40a9 SHA-1: 9e96795d9c55d1cb388164497e072201e58e0ff4 SHA-256: 620a793bd212103d29d73fb60bf764c4377dea87692bf65a1fcca7fe9d8eaf4a
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 0.9997

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://pistant.ru/pbw?utm_term=unlimited+money+and+gold+in+kick+the+buddy PDF link annotation
    • https://saremugofu.weebly.com/uploads/1/3/4/0/134017097/0ebd7b5c5e.pdfIn PDF document text
    • https://lilafigofuku.weebly.com/uploads/1/3/1/3/131398347/rejuvolidipu.pdfIn PDF document text
    • https://zemovawid.weebly.com/uploads/1/3/4/6/134608463/8523817.pdfIn PDF document text
    • https://sudateneturoxa.weebly.com/uploads/1/3/4/3/134322726/289d9ce670263.pdfIn PDF document text
    • https://sozububi.weebly.com/uploads/1/3/4/4/134459052/ef4dd4.pdfIn PDF document text
    • https://pekumovulimezel.weebly.com/uploads/1/3/4/3/134363026/kupilo.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/0e624717-9fe9-4474-bc96-3b190f5951f0/35564417814.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37231bd1-0fbd-4dba-991d-78e02e546cee/57542981419.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d689722d-18d5-4bb7-8a9f-de6a4d8bfb27/what_kind_of_jobs_can_you_get_with_a_bsba_degree.pdfIn PDF document text
    • http://betosaxugawi.pbworks.com/w/file/fetch/144791478/physical_science_final_exam_study_guide_quizlet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b4b7526-c8ea-4002-89cf-4f915a5ef4eb/essential_university_physics_volume_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b25c64c7-84c8-4025-871a-ef432afa7583/gefuzekesa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c329ac9-4f30-4ee5-b762-98d20f76ef63/ronco_dehydrator_model_187-04_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc944ab7-968e-43f0-a983-70decbe8c110/finding_slope_worksheet_answer_key.pdfIn PDF document text
    • http://kunixove.pbworks.com/w/file/fetch/144485694/tofelimokulumulup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/feedeb2a-eeba-4ef2-9008-9c9ab55326b2/45939077754.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a612e216-5428-4560-9b2a-98d0c1ae7ce7/instant_pot_electric_pressure_cooker_cookbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca97ae55-110a-49e2-9f04-7acb2bf98222/thematic_statement_examples_for_guilt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0f45249-8ab1-4cc6-b604-a94572b6790b/7959983172.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecc2e1b3-4656-42f0-b0f0-625b4a861101/romeo_and_juliet_law_ny.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a445f29-23db-4401-8762-1b7cae9294a1/equity_asset_valuation_book_and_workbook_set.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_off0000ef8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8E 5376 bytes
SHA-256: be101098a934a278a5b26d2e342bfc9e42bd5c5a44862cc45c1e0229a1d2e32c
font_01_sfnt_off000101bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BB 11188 bytes
SHA-256: 4c1dfa5fa99e289387c6d5ed5ebbfe4b4640b36d169d7625a20224b6dd5b742a