Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a528b93538cd66c…

MALICIOUS

PDF

74.0 KB Created: 2021-05-28 12:21:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: fa808bd0653c85f3d48a83be72d8d9ec SHA-1: ec0d5e14f15d85a193fb985a35b1103bb3d7c4c0 SHA-256: 2a528b93538cd66cfec0e1ac59c8dffb3f2e550587b1fd61c8a789bb2a5dd063
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, and also detected by ClamAV as a phishing trojan. It functions as a link farm, containing numerous external URIs that direct users to various websites, including one with a 'utm_term' parameter suggesting a phishing or spam campaign. The presence of multiple external links on potentially disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/123?utm_term=eraser+app++android PDF link annotation
    • https://duwiwobejul.weebly.com/uploads/1/3/2/7/132740292/2451023.pdfIn PDF document text
    • https://xabifiwalutoku.weebly.com/uploads/1/3/6/0/136085939/1109921.pdfIn PDF document text
    • https://kigivagup.weebly.com/uploads/1/3/4/3/134396191/b05e94e.pdfIn PDF document text
    • https://xixinuwomisit.weebly.com/uploads/1/3/1/4/131437484/fatotoduzalug.pdfIn PDF document text
    • https://zamomojufowa.weebly.com/uploads/1/3/4/6/134613680/9466722.pdfIn PDF document text
    • https://kamanujololide.weebly.com/uploads/1/3/4/6/134628395/5976485.pdfIn PDF document text
    • https://nogekapufininut.weebly.com/uploads/1/3/3/9/133997605/5537093.pdfIn PDF document text
    • https://sasujenag.weebly.com/uploads/1/3/5/3/135337218/925f6e1c66.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/30d8cd0b-139d-4849-9461-d16509839436/how_much_does_planet_fitness_charge_for_one_day.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed3b36e9-e470-4e3d-b283-a10b33fc7168/vizio_e370vl_remote_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6b684df-2c5b-4a55-9151-7e0387caa2b6/15466403456.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a053141a-321a-4c66-ad98-bbab3214690f/1987_honda_fourtrax_350_4x4_lift_kit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/809ed2f7-4ab9-46bd-9022-d3cc22dac14d/83837923629.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14257706-94be-49bb-9f4a-230ebce90e3c/74850127545.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d20059be-8a4a-41c8-8405-05dcbc9e1a4f/xefirobuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e827a36b-3285-4df2-a438-f98b2855ca98/nixewovodimovobafav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e89deec1-ebbb-43ea-b7ef-4ec498a25f52/73920634081.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26dfea8d-0750-46f7-a052-9cf325d7ec8f/is_there_a_monster-in-law_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc4988eb-ceb5-4de2-9c0c-472ac83eaee7/xinadoravunaxefekuwu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a74aa95-cc12-44f2-90d5-635c17b0ce9b/como_hacer_una_hoja_de_vida_profesional_2019_colombia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d21f1a4f-4657-497a-9efa-d2072b4fc0b3/how_to_work_out_return_on_capital_employed_from_balance_sheet.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_off0000e354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE354 4876 bytes
SHA-256: 8cc3400650b166efe9cde54768905d2697b443e6749470799d3dc96a35ff5b81
font_01_sfnt_off0000f3f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F4 11580 bytes
SHA-256: b80954d8e4d2d740b3e61c18aee6347529630c35c67e479dc3d82f5cca3c82b7