Malicious PDF — malware analysis report

Static analysis result for SHA-256 4433b39eb5674d87…

MALICIOUS

PDF

91.5 KB Created: 2021-09-11 20:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 58c7e781bf0dd0f3ae11f236e020ec9c SHA-1: 4a501006097ae59f2d1c4b75b7d851acebd5b499 SHA-256: 4433b39eb5674d87873f5ab2ff0a26ec7d9b95347d8b2f66de7960ce26bcf4b9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on disposable domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, suggesting the document's primary purpose is to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6118

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://bxbrdh.marketsearching.com/upload/files/sorelasa.pdf In PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161382a0e15cf1---nukokozemunazebinus.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/ninenetopu.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/34553650256.pdfIn PDF document text
    • https://cuichi177.com/uploads/files/202109110859352303.pdfIn PDF document text
    • https://brakos.it/file/6664581480.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/15741392625.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/dusemivod.pdfIn PDF document text
    • https://bellcera.60km.com/upload/files/lufavedofetogisazog.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/vaxeruxanuvawezubarixugi.pdfIn PDF document text
    • http://evola.it/userfiles/files/79682609536.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/17729212008.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/67058023712.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/69703024173.pdfIn PDF document text
    • https://vientangluc.com/upload/files/69943414057.pdfIn PDF document text
    • http://webbyshoe.com/fckeditor/userfiles/file/figewovabokulire.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109060051369009.pdfIn PDF document text
    • http://etyekilovarda.hu/userfiles/file/bilefu.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/vexedunuzasesoxopafimu.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/geburowalesetubo.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/24622520323.pdfIn PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/befimiku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=leadership+and+self+deception+getting+out+of+the+box+pdf+free+downloadPDF link annotation
    • 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_off00010608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10608 19044 bytes
SHA-256: 449a28b3ad2e44dc5243d660cbe4edcf82ac2b898d341669ceedfcbd56683dc2
font_01_sfnt_off000137bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137BF 11284 bytes
SHA-256: 726695dada451f0cfe805663d2545eeb67da09ade3a0747de4b0bbc745c394c5
font_02_sfnt_off000151cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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