Malicious PDF — malware analysis report

Static analysis result for SHA-256 b322b38d17ad9520…

MALICIOUS

PDF

83.5 KB Created: 2021-05-15 17:30:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 32d65d25755cc06635ae0d436b669064 SHA-1: 88a64e904e061f3ee9f6f15571469cee47f176fc SHA-256: b322b38d17ad9520d8f0cf582a7550fcf967e32403985567539ad859d7509e82
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://mezovuduw.ru/strik?utm_term=lost+at+sea+movie+true+story PDF link annotation
    • https://cdn.sqhk.co/vasibejovej/jdgfFjf/82350872720.pdfIn PDF document text
    • https://tesegedoveveda.weebly.com/uploads/1/3/4/8/134891870/soragukekizasoj_suluwadexoduwi.pdfIn PDF document text
    • https://lafatizurekasat.weebly.com/uploads/1/3/4/7/134748402/1172582.pdfIn PDF document text
    • https://cdn.sqhk.co/dilizilozok/eieijeN/sdge_power_outage.pdfIn PDF document text
    • https://nelovemisero.weebly.com/uploads/1/3/4/3/134347795/9840729.pdfIn PDF document text
    • http://tivepijezar.22web.org/williams_hematology_9th_edition.pdfIn PDF document text
    • https://cdn.sqhk.co/fifapupifig/chejjs9/amazon_golf_bags_cart.pdfIn PDF document text
    • https://cdn.sqhk.co/xumirikebixo/jcagehi/cat_simulator_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474223/normal_60490725d9816.pdfIn PDF document text
    • http://taranif.22web.org/gefipip.pdfIn PDF document text
    • http://wimixolumow.iblogger.org/confidentiality_agreement_template_south_africa_free.pdfIn PDF document text
    • https://nupafosudivoz.weebly.com/uploads/1/3/2/6/132682156/9156813.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379370/normal_6052a3fb91047.pdfIn PDF document text
    • https://bexusisase.weebly.com/uploads/1/3/4/5/134596812/dakafulo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/geraromu/degew.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/how_to_remove_dark_pimple_spots.pdfIn PDF document text
    • https://f039f7e9-c7fa-441d-bf3d-2f0e35d6be10.filesusr.com/ugd/80685d_c1e8d24d9af54766aa2c5259a381f896.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xeponodij/78951115392.pdfIn PDF document text
    • https://b5c90759-dbf8-4ccd-b12d-e23c958527f9.filesusr.com/ugd/915a55_40ba41911a604865b4172340c16d1c3e.pdf?index=trueIn PDF document text
    • https://43fe4710-460a-4ad3-90dc-2dd795c51528.filesusr.com/ugd/a32c20_7c65f61c060d4145876f568bfab99e55.pdf?index=trueIn PDF document text
    • https://0a497e50-07dd-462d-832d-d8678f741a8e.filesusr.com/ugd/5f857b_9de1501e0ef346cf9909ed66e60cf807.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_off000109d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D1 4904 bytes
SHA-256: 8fdf2028a8733bf5167148616177115922bd9ff9029ea4574bfae894d14dad45
font_01_sfnt_off00011a77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A77 11216 bytes
SHA-256: fe4c8e8d5748e55e93d51d62bbb54941fcae1f2b4203b939d912d26de52f3783