Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dd47e73d2deb9b2…

MALICIOUS

PDF

90.2 KB Created: 2021-09-22 20:27:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7e768c1f2242415663bb24f64de5a388 SHA-1: a460493dc4dd390d5ca233295a3017167e96044f SHA-256: 8dd47e73d2deb9b26137d1a4d34d2cbe33fd87eed2cd9f7b942a75b5d19031ff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, a common tactic for phishing or distributing malware. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://chcial.ru/uplcv?utm_term=productive+habit+tracker+android PDF link annotation
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614960a34ef24---woxosuxukekegis.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/16199900069.pdfIn PDF document text
    • https://cdmsig2.com/ckfinder/userfiles/files/xenuderozunolo.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/dotopibukasalolat.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/1632024635208859508.pdfIn PDF document text
    • http://easy-sleep24.de/shop/images/editorfiles/file/44175229587.pdfIn PDF document text
    • http://fullerton.kopanramen.com/uploads/files/80502528699.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/daxoxosojipizukigidazebez.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021092223480887.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/75167487675.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/61625564700.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/zikudazizuzilulejav.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/wunivujafesurumajuvujupol.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/jejavumopomixukikef.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/lofonodasitebuj.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/purexexoto.pdfIn PDF document text
    • https://adamslakeband.org/userfiles/file/jenotugofexelufivowit.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/wugowudixakidanugedid.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/90240420150.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/dodedetijapojikokifumow.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210909194921_mhgn7o.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/tamuwab.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/9532443565.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_off0000fa68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA68 18636 bytes
SHA-256: 95e98b45b2d4e48d20dbe87325357cc818ab89bb4590dc8cb77f70671a8f9563
font_01_sfnt_off00012aff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14316 10652 bytes
SHA-256: f74e36c5af0109471e39a096bd5edaeeeb5296257aa8a158985fa66fd545d625

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