Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f34acd423452ebe…

MALICIOUS

PDF

89.3 KB Created: 2021-05-01 17:15:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: beb7049b7ff39a6ab3e88da498612ee7 SHA-1: 2cf08d6a4e3be0cadd81bfe0b340b85432ebc493 SHA-256: 4f34acd423452ebe5fc988295c65e4a6f560aaf986171eb7c588e56915d6d35c
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, likely intended to deliver a secondary payload or redirect the user to a phishing site. The document body, though heavily obfuscated, appears to be a lure related to academic content, suggesting a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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://jacksth.ru/strik?utm_term=kuby+immunology+6th+edition+contents PDF link annotation
    • http://medicalpracticementor.com/hp_laserjet_pro_400_m401dn_ink_cartridgezp86l.pdfIn PDF document text
    • http://good-production20.site/does_td_ameritrade_limit_day_tradesqcpjv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481278/normal_60047adc5a3c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380229/normal_603dccf942770.pdfIn PDF document text
    • http://tavaxibewoposo.iblogger.org/tamil_movie_2018_tamilrockers_hd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473359/normal_5fcb3a834fcb3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377100/normal_5fdec774d577e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374517/normal_5fcb7185507e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413846/normal_602b5557744d1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://linux.thai.net/plone/TLWG/thaifonts_scalable/In PDF document text
    • http://gefelabofine.rf.gd/brevet_2020_pondichery.pdfIn PDF document text
    • http://fixurepaxow.rf.gd/2263883578.pdfIn PDF document text
    • http://vavijirodujozi.rf.gd/13272499906.pdfIn PDF document text
    • http://tokafibalo.epizy.com/16023136174.pdfIn PDF document text
    • https://72be5e1b-4d14-4335-96ee-88463f604c48.filesusr.com/ugd/57ecfe_22571fe611944d54a62ab68252d73073.pdf?index=trueIn PDF document text
    • https://34ec465e-51aa-4dba-9a8c-c05fcfb5ae84.filesusr.com/ugd/df15ee_fdafece085894f28bdd4ceb1483f07e6.pdf?index=trueIn PDF document text
    • https://45f61934-b4a1-4335-a9e3-e142d9465b5b.filesusr.com/ugd/0dd040_2546770477ac489688d033d398d92e25.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA4 5412 bytes
SHA-256: 4dad0c1a158b0d6bba965e3bd8589b038c7fbd67c67c8401f7674046805fe4aa
font_01_sfnt_off000101f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F9 11632 bytes
SHA-256: 6977f81cdd878ed57cd7cda5b8cfcba7088f19316c89860ff1ecaabe60dcf42b
font_02_sfnt_off000129c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C2 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501
font_03_sfnt_off00013eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EED 9244 bytes
SHA-256: d464ee5172e6c0854cfcf8ce714cdad2c6a50113349ebf78eb4d07d05ffc5650

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