Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fa532f9fddcfc93…

MALICIOUS

PDF

78.3 KB Created: 2021-10-09 13:52:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 861657058e34d1b96ed153619b0417df SHA-1: c38285ba5cfd9f9b6007cbaef7f8f03484da5c12 SHA-256: 4fa532f9fddcfc93a853cb31354df3903a5247067c89366c806bafa17191e8db
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a high density of external links on disposable hosting. The embedded JavaScript likely facilitates the redirection to these external URLs, which are characteristic of phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://smidgel.ru/uplcv?utm_term=history+of+mergers+and+acquisitions+pdf PDF link annotation
    • http://studiozoppini.com/userfiles/files/vonoguwirada.pdfIn PDF document text
    • https://myoffice.acqualive.com/uploads/files/lumir.pdfIn PDF document text
    • https://southernwashpros.com/nbloom/fckuploads/file/58793819174.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/zewakipekadesixilos.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/jexonuj.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/85339970940.pdfIn PDF document text
    • http://yugreat.com/filespath/files/20210914021515.pdfIn PDF document text
    • http://pataibicaj.hu/userfiles/file/67452039094.pdfIn PDF document text
    • http://effekt-film.de/files/file/42562967186.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/gajabamumodojojex.pdfIn PDF document text
    • https://bfull.ru/uploads/files/34072432534.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/37986535248.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/bodip.pdfIn PDF document text
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/48845139757.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/66846696646.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/6a06bf94a41efcb3619b54420ed08b93/kipafedixonuwaxe.pdfIn PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/wexilovowuxizevos.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/ninupupidexowedimifa.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/meziguterojoxuwurafeke.pdfIn PDF document text
    • http://entrackintl.com/uploads/fofesuzok.pdfIn PDF document text
    • http://whitesal.com/data/images/file/8727_20211003051610.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/73266405980.pdfIn PDF document text
    • http://ourconn.com/userfiles/file/202109101212167036.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/0b8ff3bd4add4b82710dd9c2620e150b/32919418994.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/9271816264.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_off0000cbdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDD 17304 bytes
SHA-256: 90b787fc0cc432ccb9631b5897cd8b1d81627d44460ae0401a67ce03951aeea9
font_01_sfnt_off0000f8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F3 11268 bytes
SHA-256: efa93d1a73e082eef5c533562f22e8374e22e0992c5b244771370dfa5fc78a94
font_02_sfnt_off000112ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1