Malicious PDF — malware analysis report

Static analysis result for SHA-256 e108848ed27ed2b8…

MALICIOUS

PDF

82.7 KB Created: 2021-09-17 09:24:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fed5493a25ee72e92961e92d27489585 SHA-1: 37d8a44d3da54dcdc2191e110bcdb5790f81a793 SHA-256: e108848ed27ed2b8069d142be122d63e60ef551257a6cb5bcbb3a9d3da824dc7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, many of which are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a deliberate attempt to obscure the final malicious destination through multiple redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://coretry.ru/uplcv?utm_term=minecraft+apk+java+edition+pc PDF link annotation
    • https://atamergranit.com/userfiles/file/lunozuranoxuwaw.pdfIn PDF document text
    • http://www.poliklinika-hb.cz/userfiles/file/reselepoviwetifexowe.pdfIn PDF document text
    • http://analhospital.net/file/files/fapekavawa.pdfIn PDF document text
    • http://homeloanz.net/images/e/file/46152009874.pdfIn PDF document text
    • https://tdfstore.it/file/witapimupomiragirures.pdfIn PDF document text
    • https://bselink.com/userfiles/file/tiwawakize.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/86492937430.pdfIn PDF document text
    • https://promise-land.com/upload/file/depagoxetigogowovupuw.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161312d05c53d2---69775339592.pdfIn PDF document text
    • http://garmaclima.com/uploads/ckfinder/files/gituzikodowuwepafesez.pdfIn PDF document text
    • https://letajicikoberce.cz/userfiles/file/60973710948.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/22912880768.pdfIn PDF document text
    • http://xaydunghoangthanh.com/img_duhoc/files/gojevaripepizubidiwuzo.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/6517657633.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/52072559293.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/35445507013.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/xixezorinopipemur.pdfIn PDF document text
    • http://ncteonline.com/userfiles/file/nogimovafes.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/c340e9bfa96c51867b380b61ed8cb884/dodojusufuserugipolidulo.pdfIn PDF document text
    • http://musicpark-live.com/userfiles/file/45951179272.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/nufopasejuzamisigutekef.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/91263911977.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/buxufufuxinorifumuriniwi.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/lunutowibu.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_off0000df4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4E 10680 bytes
SHA-256: 8aed34bb2d508fe6bbd07f655a0e4972ee1311b8075c0898c5f017e3a15e7cd7
font_01_sfnt_off0000f7ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFC 17500 bytes
SHA-256: d16d41107d2d1edc5beea03940ef7861305770ca09243bdb31d3994201a0074d

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