Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e9d963507804abe…

MALICIOUS

PDF

77.7 KB Created: 2021-04-15 22:04:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: d28de2fabf8d3a3c1596ed320d6e6388 SHA-1: 5bd5031e0fe1f2576bc94e5d68ed2ad5cd88d286 SHA-256: 0e9d963507804abe33e19b824cfd4cbc253e59951ec5ea41220d813455f94671
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many of which point to disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or SEO abuse. The embedded URLs suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ponafet.ru/strik?utm_term=what+were+the+main+points+of+95+theses PDF link annotation
    • http://dibesugumika.iblogger.org/pemezonuku.pdfIn PDF document text
    • http://lewijufe.sportsontheweb.net/35201169613.pdfIn PDF document text
    • http://geniusenglish.space/asking_answerable_questions_evidence_based_nursing3pmfw.pdfIn PDF document text
    • http://zekojotewakugag.mypressonline.com/kilekewubuxebigowenon.pdfIn PDF document text
    • http://whitetwo.space/48304896086a8tr2.pdfIn PDF document text
    • http://padlamadla.site/what_is_the_chemical_equation_for_protein_synthesisp9a1w.pdfIn PDF document text
    • http://xenuven.22web.org/385776350.pdfIn PDF document text
    • http://antonioita.fun/zilunimazqaxi2.pdfIn PDF document text
    • http://taxokijoba.sportsontheweb.net/23191787504.pdfIn PDF document text
    • http://domavera.ru/91394370082o2tzj.pdfIn PDF document text
    • http://rexasokozeg.iblogger.org/how_many_electrons_are_in_the_3p_sublevel_for_phosphorus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4192d618-ecd7-4808-8485-efd4d6773ded.filesusr.com/ugd/17a5db_9315abfb8e2749749f0099a3111901f7.pdf?index=trueIn PDF document text
    • https://fecd0c08-032d-4b8b-b26c-6108aca7a00f.filesusr.com/ugd/a87c8b_d9e9e1db3d6f4d9d8355e7bd56de05dd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/09426069-8103-4151-8024-3a6c98cae00f/do_mutual_funds_have_symbols.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98b1ac01-3e25-4951-b28c-264ce4b8dfbf/gudabotaxixukovuvegorusil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c30481ad-b550-4a92-bde9-6004a4de2e92/19682111455.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bb7f187-b91a-491c-b547-e15080b061ff/31233341995.pdfIn PDF document text
    • https://0fc0baf9-b884-4fcd-968e-f93c0f938930.filesusr.com/ugd/68ec51_5a4e9f12a4354188ba3b90a686df5669.pdf?index=trueIn PDF document text
    • http://serudijukidat.epizy.com/purble_place_play_online_without.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22f6643d-e74b-481d-a8a1-e8436a1fd652/how_to_assemble_greenworks_2300_pressure_washer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05f192c0-6342-49cd-b319-aff701c8546a/what_kind_of_culture_do_you_thrive_in.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d3aa546-b08c-47a8-a758-a6496f60054d/51437808311.pdfIn PDF document text
    • https://025b4bf0-2906-4f5f-8a0f-6d4b68fc9518.filesusr.com/ugd/148ee2_aa13a0c423fe4de298dabb1c308d2e53.pdf?index=trueIn PDF document text
    • https://2dcb0092-dd22-4cef-90c1-8c398f802bb7.filesusr.com/ugd/ff3115_57c4f9a64f84476f9a2a7ecb9026f6e9.pdf?index=trueIn 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_off0000f274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF274 5496 bytes
SHA-256: b8f0dc686f0a53992ddc34a0a2087ff0441c210c0ff3d7f0295d1bea76cbd070
font_01_sfnt_off00010512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10512 10740 bytes
SHA-256: bfe9044a9f845c570d77ff1b3dc1ea1e2dbd61a947b951c51dad53a7a04b86d1