Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a18bd6b4217bf1a…

MALICIOUS

PDF

74.6 KB Created: 2021-09-13 10:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 163e1c06684ff9059a7e041d80c33dc1 SHA-1: 535a96f8176b60f9c7472ed355ffa83a0a3e1e70 SHA-256: 3a18bd6b4217bf1a3bb323a65ed3af5a6b800a54f77c99aa8ae630fc317abb31
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded URLs, many pointing to disposable domains, characteristic of a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the sheer volume of links suggests an attempt to direct users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://blsautomation.com/ckfinder/userfiles/files/botomija.pdf In PDF document text
    • http://unibox.lv/files/text/39733925130.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/kegudalixovorib.pdfIn PDF document text
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/bovulikuwokuzadobonekag.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/wozilujojuzekadovejufej.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/42884399111.pdfIn PDF document text
    • https://angem.fr/userfiles/file/14188304884.pdfIn PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/fizalenexojolew.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/sekozebataxonikageg.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/13945510336.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/20381826559.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/pixebovimivaxufuguxa.pdfIn PDF document text
    • https://eurotig.ro/file/99916545903.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/58764057310.pdfIn PDF document text
    • https://slotpt2.com/contents/files/wowudowowevewi.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/25399774782.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/zozidutafixepomegatin.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/kaduvujixadogerabidowijem.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/rowawowekumusitaz.pdfIn PDF document text
    • http://beiks.info/public/file/23177772180.pdfIn PDF document text
    • http://lawyergz.net/uploadfile/files/14064124286.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/21406631720.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6c82444a0---64242411058.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/32804896318.pdfIn PDF document text
    • https://benmoonpharma.com/userfiles/file/pifewazasaduwid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=reflector+activist+theorist+pragmatistPDF link annotation
    • 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_off0000c236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC236 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA48 16052 bytes
SHA-256: 8936da77af1e3e25eb3b1364999bc367dd3a1794b11b235ea086de1f9b350559
font_02_sfnt_off00010335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10335 10936 bytes
SHA-256: 132b7509ab11528f0658883f09ded857e2f2ff04d64749e4ff2f1e07d9ae582c