Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff88a44add7b367…

MALICIOUS

PDF

77.0 KB Created: 2021-02-27 10:16:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 638e477a3256578f2424ce65e998a1b5 SHA-1: 123e4e19068d519b9dc45e2c9ece1f2cbbf411e4 SHA-256: cff88a44add7b3676b4eef5f07a1dce96ac7dc6f292aad4a88891ecc15a996aa
186 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soxebez.ru/strik?utm_term=game+programming+patterns+nystrom+pdf+download PDF link annotation
    • https://cdn.sqhk.co/vupapevixu/icgeWhd/mx_player_apk_free_download.pdfIn PDF document text
    • http://groby-ritual.online/vofasusofafusiraloxiratudl0kty.pdfIn PDF document text
    • https://zupeloniz.weebly.com/uploads/1/3/4/0/134018773/rifotumopura-godijevorim-vatodomo-zutibipaxelojid.pdfIn PDF document text
    • https://cdn.sqhk.co/xitilesuxiw/Kzhidjh/18643827567.pdfIn PDF document text
    • https://gavemipaxok.weebly.com/uploads/1/3/2/6/132680822/5ecbde8c.pdfIn PDF document text
    • https://lupolaluxu.weebly.com/uploads/1/3/2/6/132681144/9242999.pdfIn PDF document text
    • https://kevititexozasen.weebly.com/uploads/1/3/2/7/132712545/rusevob.pdfIn PDF document text
    • https://rikelakejif.weebly.com/uploads/1/3/4/8/134885243/butodare_zizukomukokugup_luwotavot_zatupukural.pdfIn PDF document text
    • https://bivilasafufi.weebly.com/uploads/1/3/4/6/134689398/sifarop-tirirupibaden.pdfIn PDF document text
    • http://shopbest.online/how_do_i_fill_out_a_proof_of_service_by_mailw1cm6.pdfIn PDF document text
    • https://bufigolumixi.weebly.com/uploads/1/3/4/2/134234787/tosobemor-jipimuxi-walurezu-mijajufososod.pdfIn PDF document text
    • https://tifomuzaki.weebly.com/uploads/1/3/1/1/131163977/muniwemozinul-xufevimuxasaza.pdfIn PDF document text
    • http://fishland.store/pigeripuworokejeter3jp.pdfIn PDF document text
    • https://xagotixuben.weebly.com/uploads/1/3/4/6/134685277/07d13.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/jinabom/challenger_school_uniform_used.pdfIn PDF document text
    • https://s3.amazonaws.com/resisuna/steel_magnolias_funeral_scene_script.pdfIn PDF document text
    • http://rujidafedisezu.atwebpages.com/26576867617.pdfIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/47781749896.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_off0000ee6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6F 5584 bytes
SHA-256: ab92dc593db9753faf7b46e426a0e2ca657a1ec5a90235590f50feb56b9268a0
font_01_sfnt_off00010174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10174 10940 bytes
SHA-256: fb8f6eea5d1b7e2db6b6eddf5dc33a24cdcab5e34a0a6d80acd52d5ca5c18fba

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