Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9634f2ee93b56c5…

MALICIOUS

PDF

74.7 KB Created: 2021-06-08 04:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 01aced0508ec4a18b4a287303cc9cbe9 SHA-1: d2ed4c941f4a81cf4f8bc47ddf89e6ae359854e3 SHA-256: b9634f2ee93b56c51065c624fb88d8057c8e465fe68e56861c4cffe68e3d625e
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://crewmak.ru/pbw?utm_term=where+to+get+passport+photo+taken+columbus+ohio PDF link annotation
    • https://vepibasizux.weebly.com/uploads/1/3/1/3/131380915/pelezopuke_totigoku_majotarikufotek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408709/normal_600bf420a719f.pdfIn PDF document text
    • https://tatefazaseg.weebly.com/uploads/1/3/4/0/134016926/3191365.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380230/normal_604e61f80a220.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385012/normal_606440c9de9be.pdfIn PDF document text
    • https://josapepukixo.weebly.com/uploads/1/3/1/3/131384602/82aed10d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418558/normal_5fe22a7493584.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/471abf76-1eaf-4a3b-bc02-d514850ccb2b/rock_ola_jukebox_model_468.pdfIn PDF document text
    • http://wovonixir.pbworks.com/w/file/fetch/144731070/fifokaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5f72ea2-e65f-460c-9d89-acc665b7eee3/kojifadukaju.pdfIn PDF document text
    • http://xegosigex.pbworks.com/f/nvidia_geforce_8400m_gt_drivers_for_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b22daeae-0d6f-4759-9416-28929c6ae58e/english_course_for_adults_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3881bab5-97ad-4c66-9c06-224523394340/how_to_drain_sharp_portable_ac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0822efce-1c2d-4ce6-92a9-e7fdd02836ab/carrier_weathermaker_8000_error_code_34.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c149c94a-b66b-426a-8310-4c1653d1b178/kitedusavokobimozaburu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19a1c131-5578-4b92-b3c1-f0dcb205ae07/how_long_to_use_far_infrared_heating_pad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3d9e982-99c3-47e5-bb68-0aa4e51c192f/the_shining_book_summary_sparknotes.pdfIn PDF document text
    • http://jumogitakos.pbworks.com/w/file/fetch/144828960/cambridge_audio_dab300_digital_radio_tuner_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c388763-91cf-4f45-a939-c3f2e7849129/xanexodudikexutuwexokon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/607c6220-a9dd-4e8c-a0be-82f6e0bfdf61/cessna_150_plastic_interior_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ac3a05b-1cfe-4c12-8e17-b6463db57446/34198583296.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_off0000e5dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DD 5564 bytes
SHA-256: a66c9e199bff6d4afdd3bc22421bb2d41d68c0211d3d5c2ba72fa8fe23257958
font_01_sfnt_off0000f8b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B0 10644 bytes
SHA-256: 60102e091ef9afbcb3ff6ef86a9009a36acc0efafecca39fa26755d18d660636