Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd7fdc682124a21d…

MALICIOUS

PDF

91.3 KB Created: 2021-03-03 11:42:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 136f5f674e7d33c3c04f8f05620d0f17 SHA-1: d650843ab8b35a2e8b46c7665898ad40471ef47e SHA-256: bd7fdc682124a21d6a5b3f35857ac4efd50afe2f75620db233d35ac21dbffd7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains a large number of external links, with one pointing to zajinet.ru, suggesting a link farm or phishing attempt. The presence of embedded URLs and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/wix?keyword=the+night+parade+of+one+hundred+demons+pdf
    • http://vevaxogejaz.scienceontheweb.net/is_the_2010_mustang_gt_a_good_car.pdf
    • http://qqkaxes.xyz/fellowes_jupiter_125_laminator_jam68utc.pdf
    • https://tavutapakewig.weebly.com/uploads/1/3/5/3/135399939/6356664.pdf
    • http://martakkord.ru/bebawolw4pcg.pdf
    • https://walagikolisof.weebly.com/uploads/1/3/4/4/134494282/ed0d4226.pdf
    • https://xadonuxezi.weebly.com/uploads/1/3/4/1/134131919/gumikales.pdf
    • https://fefajuvojamunuj.weebly.com/uploads/1/3/4/7/134750085/6171849.pdf
    • https://cdn.sqhk.co/bokirebi/jfH4QGk/new_romance_of_the_three_kingdoms_mobile_guide.pdf
    • https://mizavuzozubex.weebly.com/uploads/1/3/4/7/134730625/257cade0288.pdf
    • http://igcopyrightforhelps.com/jivixok5wair.pdf
    • https://xolesozetenosox.weebly.com/uploads/1/3/1/0/131070434/9406575.pdf
    • http://lozomaneje.getenjoyment.net/uniden_bearcat_scanner_bc145xl.pdf
    • https://roriwemako.weebly.com/uploads/1/3/4/5/134599113/dewuwofozes.pdf
    • http://girlsbeach.space/do_all_cva_muzzleloaders_have_bergara_barrelsdiy14.pdf
    • https://pobunusegem.weebly.com/uploads/1/3/4/4/134460984/4d1c456.pdf
    • http://reduslimitalia-official.website/20755934762vofso.pdf
    • https://wobelafesuta.weebly.com/uploads/1/3/4/7/134767333/c866c3ede9ceb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zatazewoz/poemas_de_otros_mario_benedetti_libro.pdf
    • https://s3.amazonaws.com/zodererezuzuxi/aiag_fmea_4th_edition_free.pdf
    • http://zorikeroz.onlinewebshop.net/8796166699.pdf
    • http://wulibazosuxib.onlinewebshop.net/karcher_3.99_pressure_washer_problems.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efd1.bin
0e9e5e25163ee55fec24f731e5a9a74eb051876530bb98a3897c5606bf72b1b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD1 17540 bytes
font_01_sfnt_off000127ed.bin
07162de550fd7e84c4ace20070614b9feb453fbadfd3f90c051766179a562604		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127ED 5372 bytes
font_02_sfnt_off00013a0c.bin
df8ce7920221335b7c1f88f4f3629b7fa471f8d37cafd5a6d38900e89780a421		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A0C 10200 bytes

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