Malicious PDF — malware analysis report

Static analysis result for SHA-256 23dcd5bf8e139732…

MALICIOUS

PDF

76.5 KB Created: 2021-05-30 23:08:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e5177a75f7ffebcc4316344cbf69a002 SHA-1: 8e1d529f56516afd291804bdf8d025c150618961 SHA-256: 23dcd5bf8e139732bf45f7bfd39d6787823cffc86e96a79ea972e2d21dcafefb
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://ponafet.ru/strik?utm_term=how+to+get+a+lamborghini+in+gta+v+cheats PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448976/normal_6061fd3d15072.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4487409/normal_60b1f0c04c698.pdfIn PDF document text
    • https://luvinazomefad.weebly.com/uploads/1/3/4/3/134308035/degasizubikamegewe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459060/normal_5fec0663624c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468286/normal_6067e6677ab3d.pdfIn PDF document text
    • https://kimukotepasa.weebly.com/uploads/1/3/5/3/135329918/vufafuregemuxata.pdfIn PDF document text
    • https://notalajamuneno.weebly.com/uploads/1/3/1/3/131378915/6142783.pdfIn PDF document text
    • https://rurevudo.weebly.com/uploads/1/3/4/2/134265418/b6bc8.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/50ed3d05-b924-4fbe-a5c4-9011cc0ba9fb/zamadase.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70cca879-155c-4dc0-a663-fca6d7dac859/5880752612.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b7d2242-8b5b-45fa-8ef7-28eeb7d5fab3/disujevozedewaposujituk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21db2f81-456d-4601-9f84-f3309aaee7d1/proyectos_de_inversion_formulacion_y_evaluacion_de_nassir_sapag_chain.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9469ba5b-3b96-41d7-b95e-4367f2bf1b3f/does_sims_3_xbox_360_have_expansion_packs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb4c499f-5d2a-4b4b-a000-ceafb08e2711/57348576954.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9b07268-d74c-425b-ae16-4e20a602632e/bbt_bank_wilson_nc_27893.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5ef9f5e-ed0c-4f0f-8bc4-fabdc3ba7d6c/46940101857.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03b97ba7-d0f9-48bc-a8d8-f07856747352/suxasiwonazoder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd1cad70-3296-4107-bd4e-34a9bde4692b/87069015949.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cdcd7d1-5216-4e79-9b01-cda6732239eb/fallout_4_all_map_locations_perk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fe83f8c-52a4-4ea0-ac3a-3abb645ec2a0/placing_equivalent_fractions_on_a_number_line_worksheet.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_off0000e9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D8 5464 bytes
SHA-256: 719a91b70bbad57fd98192ce2fabcc8c44e83b210e7acf71567e13289ead1adf
font_01_sfnt_off0000fc5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5D 12572 bytes
SHA-256: f2202177adb85bdc82e2a1fb3452fddc737e94662c6c86a47b7863bf26cb2c8f