Malicious PDF — malware analysis report

Static analysis result for SHA-256 9152248f62de4465…

MALICIOUS

PDF

71.6 KB Created: 2021-09-24 10:12:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 697d59f6749f3acdd137367a39141e01 SHA-1: 16edcdff1db230e9c57e795fc64d93bb220a37df SHA-256: 9152248f62de4465f84f964f62896ca637633c347c6afc02cba4b96440697a6e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URLs, many of which appear to be part of link farms or disposable hosting, suggests a phishing or malware distribution scheme. ClamAV and ML classifiers strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cructi.ru/uplcv?utm_term=bangla+boi+pdf PDF link annotation
    • https://n-zvuk.ru/upload/file/76856180962.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/zanepovojatej.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/42616e90fd8d3ab8fef3e2856b9548f4/6682373414.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/sabaxexiferiliriseter.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/divitogisibuxebegufa.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/14246834795.pdfIn PDF document text
    • http://hasicimosnov.cz/foto/Image/file/nijimikivaturilegapamejuv.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/54710634166.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/fakajinanut.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/34241291332.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/83825185262.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/33054891389.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/fotobuwiziganowed.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/66115488548.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/xatewamijaxegufil.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/musopige.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/jadofu.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/jepexosedu.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://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_off0000b73a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB73A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF51 10368 bytes
SHA-256: a0fd68bb7f6ca6284cefe255a8294cb0b12d2b8e458a59db16a7491f73435227
font_02_sfnt_off0000e650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE650 16528 bytes
SHA-256: 92b6154c90ec446dcd2b0ed9315465eef1d32d43e26f6a5685f04b55ff6aba0a

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