Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7a260339a367f59…

MALICIOUS

PDF

82.6 KB Created: 2021-10-11 19:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ecd95d6ec806703fb4ec219dd38cb8d7 SHA-1: a2cc7f12eec437af3f497e72c598ee76857ff61b SHA-256: d7a260339a367f59ce5222f9a4f3d6508f14c69df6d8d7d1bb47f1bde3053aaf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs, many of which point to PDF files hosted on potentially disposable domains, suggesting a link farm used for phishing or malware distribution. The PDF's structure and embedded links indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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 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 http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1613de1564076c---77248670088.pdf In PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/jawonurabomevugi.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/gusudituwuvujanemikanesu.pdfIn PDF document text
    • https://glozorcom.merlak.ru/userfiles/file/90252266508.pdfIn PDF document text
    • http://henzefashion.com/userfiles/file/wulelevazezivimetefusajo.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/48174649062.pdfIn PDF document text
    • http://imaginove.eu/data/Files/dokimom.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/34992367406.pdfIn PDF document text
    • http://belly.bpv.su/content/files/files/vipizolamezibijejawekufo.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161413d84474b8---35126374302.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/50157136772.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/petudorome.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/teledugowowafaxuzu.pdfIn PDF document text
    • http://fuku-zou.com/userfiles/file/99735294270.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/47569673236.pdfIn PDF document text
    • http://mp-journal.com/media/file/wejazibozanetumimaduretan.pdfIn PDF document text
    • http://na-bytecek.cz/UserFiles/File/18543765325.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/81955165464.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20211006124733145.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/kuretiwiwerevamoruxubemas.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/fakunegitexezogofiwode.pdfIn PDF document text
    • http://plncse.hu/php_data/file/62843099943.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/83787061417.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/HKUGBsJGI0E/uplcv?utm_term=jee+question+paper+2021PDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD712 10728 bytes
SHA-256: 57567c30b6e8104599bf02a1353f94a93f7efd324830d7c95fb0bbebe7e01fca
font_01_sfnt_off0000eff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10803 20784 bytes
SHA-256: 8c586b4eb73e272dda845953ef42ce1fa25ef6bc401893b130429ee8a2f009b0

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