Malicious PDF — malware analysis report

Static analysis result for SHA-256 e63374f9053542b5…

MALICIOUS

PDF

77.7 KB Created: 2021-09-20 08:12:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ad061e5e4e17603dbd10f78926e4d74a SHA-1: 1d5553515466d1777d29fcf1e6d9da928e3be951 SHA-256: e63374f9053542b594f236216dc7f6421023009b8c09158712b6279924632c8b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as malicious and by an ML classifier. It contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains and are likely used for phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, reinforcing the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://infrive.ru/uplcv?utm_term=daily+editorial+app+apk PDF link annotation
    • https://holcom-wd.com/webroot/img/files/totetoje.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/lokoxu.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210911_CDD8F8B3D66F0635.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/mipizarunexitojon.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/gosimubogapajubosu.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/72313520689.pdfIn PDF document text
    • https://inprovitchile.com/ckfinder/userfiles/files/22576433360.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/piwet.pdfIn PDF document text
    • https://talenthunt.biz/userfiles/file/63412384551.pdfIn PDF document text
    • http://terminsk.by/pics/files/radejitamipunowe.pdfIn PDF document text
    • https://fishboat.hr/files/xusuzosowasup.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/mujefufijexubososikeraza.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/masupi.pdfIn PDF document text
    • http://puisan.ru/uploads/file/53663687596.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137377b0bd73---57646417556.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141dd7b03a86---19213100301.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/nomezutovufab.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109050148078153.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/zixixutilatitubiruzixituw.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/2281529541.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/vaxisuviwizisek.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/gisikidivojulawo.pdfIn PDF document text
    • https://homecareangels.ca/files/files/files/tunuva.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_off0000c808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC808 10320 bytes
SHA-256: 38ceae9ba865f4d27f22a29e258e5b48a6448416bcb7f9e248ae18e5f262c322
font_01_sfnt_off0000df61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF61 18956 bytes
SHA-256: e0f25d4a2a4d55ae3d1491ee005d5b94e425a1cf26b4d60671a595ad8f186a43
font_02_sfnt_off000110d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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