Malicious PDF — malware analysis report

Static analysis result for SHA-256 bae654499d6c83a3…

MALICIOUS

PDF

80.8 KB Created: 2021-09-11 23:36:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 36d448bdfd9d38acf3defb01f5284d48 SHA-1: 3b7a8501d9863173721bb44231529eb652c754fe SHA-256: bae654499d6c83a3f77687c99f4b2d8f6525a1f93f866d4d61af4496dbcf899d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting the user to these external sites.

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://studiolegalebisantis.it/userfiles/files/xipuvumadusum.pdf In PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/58574546647.pdfIn PDF document text
    • http://elitk.ru/_files/87863555478.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/24585355934.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/wojawimavabewege.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/30848965998.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/zarulidulevezuwujumanez.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/dekimumuw.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/79390825936.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/63905864982.pdfIn PDF document text
    • http://cosmoscm.com/contents/files/83998157923.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c63b4e2e69---gubezusinekomimiduzawutiz.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/43893471951.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/kukili.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34010984189.pdfIn PDF document text
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/98414664693.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/72525465257.pdfIn PDF document text
    • https://sainaudit.mn/File/15251408203.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/67181652676.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/59094120463.pdfIn PDF document text
    • http://minipit.com/data/files/duvulidujapugekovok.pdfIn PDF document text
    • http://machulski.com/public/file/34052102913.pdfIn PDF document text
    • http://dade666.com/userfiles/202109file/2021091110483270554.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/fifotewuvo.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/sitoxakasuvasez.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/28843287244.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=voip+push+androidPDF 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_off0000db58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB58 10280 bytes
SHA-256: 358ab64d65f99eb0aa2e7934a5f78af1bfe564c4a2f8c30677ab1aa9e07eb97a
font_01_sfnt_off0000f25d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25D 16684 bytes
SHA-256: 72b0a12e0fa2e974e48d51f5dc9758aaa10e4f0e71479917cb9c2950a8b72945
font_02_sfnt_off00011dc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1