Malicious PDF — malware analysis report

Static analysis result for SHA-256 671d111d48529819…

MALICIOUS

PDF

81.5 KB Created: 2021-09-17 17:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bda4529a6e85d3a89359bed41bfe9e81 SHA-1: 9903d89bec6f17d2f441584c01b678687b039f7e SHA-256: 671d111d48529819a47c43680fba8130a99ea15c216e5ea7f86a60c627e8cfca
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via the linked PDFs. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://langeline.com/ckeditor/upload/files/fakex.pdf In PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/88378630053.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/1464381831.pdfIn PDF document text
    • http://poorclarescork.ie/images/wuzisumimexa.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/weroza.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/kesedu.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/88941650932.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/69446470141.pdfIn PDF document text
    • http://majedalkarkhi.com/pics/file/20186393159.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/205007826461329028a514b.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/legonifor.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/55337354407.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/buvinolikexog.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/19863119507.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/37645456183.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/42948474065.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/31328172145.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/xefiwogarapenifulosa.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/metolilinezal.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/faei6f7llupumdnke2fo36dhv0/tidarajidawe.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/zenafipatuvapujiloxapapaj.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/xisitawilufukelowelemotuw.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/31998576539.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79086642974.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/1427549599.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/67921629480.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=bestia+sam+leon+pdfPDF 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_off0000d707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD707 18996 bytes
SHA-256: 27c6a68a9be5f5a81148b2fdd4efae6a5d3c8982ba63d9e8e48fa9f23ddc663d
font_01_sfnt_off0001086c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086C 10612 bytes
SHA-256: 3476e31ca3c128d0ac22e1ebdddbe29d79fae2131384a5a1416261082f447aaf
font_02_sfnt_off000120ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1