Malicious PDF — malware analysis report

Static analysis result for SHA-256 a342ec42f4df5a4e…

MALICIOUS

PDF

79.4 KB Created: 2021-05-21 11:51:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 101e2a36b63ff04bc78f56252f623adf SHA-1: 1102d725031fc4a626a15b3ce13d65fe6d200210 SHA-256: a342ec42f4df5a4e5b1221db5edad0884b61d12bf569c0e2ce5962ab358be005
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 0.9994

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://mezovuduw.ru/strik?utm_term=modelo+de+virginia+henderson+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4443619/normal_6039029785742.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486984/normal_60383eada8939.pdfIn PDF document text
    • https://rilodogalaru.weebly.com/uploads/1/3/4/3/134398508/4354474.pdfIn PDF document text
    • https://wezawemexa.weebly.com/uploads/1/3/1/4/131410399/waleseketo.pdfIn PDF document text
    • https://jadekida.weebly.com/uploads/1/3/4/3/134349878/zoroxonu-taluvugijaxeku-kumukapon-fidum.pdfIn PDF document text
    • https://refitefajo.weebly.com/uploads/1/3/2/6/132683069/runajawidenep-kezakemotero-kawikekufep.pdfIn PDF document text
    • https://tipurovus.weebly.com/uploads/1/3/2/7/132741110/tinuzubanafix-xosaxafodi.pdfIn PDF document text
    • https://faberumul.weebly.com/uploads/1/3/0/7/130739640/451a46aefa7.pdfIn PDF document text
    • https://xikoroto.weebly.com/uploads/1/3/4/3/134338579/jeromi-zawikami-xuburetetu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475376/normal_601cf0a4b12f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474465/normal_600dfcb762c61.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/da6ad063-cfb4-4b10-b71e-47f7e237973d/analog_circuit_design_textbook.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxuledo/actuarial_report_on_technical_provisions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a67b53d9-9ef1-442f-9d7a-f5ab1a4f93b6/altec_lansing_life_jacket_2_pairing_mode.pdfIn PDF document text
    • https://s3.amazonaws.com/rojalexipokadaz/lomefosukadowovejimisub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1674cb91-b0e2-453d-aec1-bb223b2b7acf/programming_and_problem_solving_through_c_language_notes_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/627c236c-42c7-4955-99aa-972867b33803/roland_td30_module_used.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/the_wave_movie_1981_trailer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c61390f0-d115-4b43-9879-081d7b4e4211/how_to_turn_off_standby_mode_on_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93a3a7fc-a9c1-47f0-bd92-2c6a8025a8a7/2003_dodge_durango_5.9_towing_capacity.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed1889f7-50da-4b58-8985-ae1b5efc07fb/xegeli.pdfIn PDF document text
    • https://s3.amazonaws.com/tigovatolis/anemia_de_celulas_falciformes_con_crisis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14f258f9-3026-4ea3-9045-ba391b4ecf82/zavoku.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_off0000f65f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65F 5368 bytes
SHA-256: 36a633c2aaee2e88b58061ebe88a7b271b9a5b4de8399fb8772776eeb63e07b3
font_01_sfnt_off000108b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B1 12460 bytes
SHA-256: b369b06ad4c3725f6db6c37bb30a470579abfd2e7f31a006c6ebe5bf9447a776