Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b05ae7587459ba7…

MALICIOUS

PDF

85.3 KB Created: 2021-09-20 16:11:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6e6d38ca6adc5955949d3ed70120a63d SHA-1: 65253c3a3bdbfdb577734d813d711d87a9e94aa1 SHA-256: 5b05ae7587459ba7ef62a455fc0b30f01a0ec832376052b982aecd23f359e1f4
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 potentially malicious or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://bishnutoursandtravels.in/userfiles/file/68101662070.pdf In PDF document text
    • http://ameshamagazine.com/js/upload/files/femufurowamegugu.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/56748945595.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/161325cf2cf1fb---dunafuvasiradabo.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/kebetijuzuxugirotewax.pdfIn PDF document text
    • https://emailing-online.fr/uploads/userfiles/file/zozixajugekowar.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/14701347599.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/jiwenuv.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/pojuluzapagunibivudab.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/613942b3b0358.pdfIn PDF document text
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/wiwilevilozutijis.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/mokezitozawepunoz.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/c87d9d88d719587464ae1c92fad1402b/78399070369.pdfIn PDF document text
    • https://actsonics.com/uploads/files/202109200544417228.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/fezenabilosowewevavirogul.pdfIn PDF document text
    • http://www.tecnobor.es/ckfinder/userfiles/files/newiweperubozilirev.pdfIn PDF document text
    • https://krainaogrodow.eu/zdjecia/fck/file/pibirajakifagejo.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/42605419142.pdfIn PDF document text
    • http://swiss-ex.com/images/blog/file/wotukejenevo.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/33573735359.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/98839856124.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/37573199982.pdfIn PDF document text
    • https://newline-eg.com/userfiles/file/zafaguwiturunow.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/31320727922.pdfIn PDF document text
    • http://skncn.com/u/files/xutofokibirimiwenog.pdfIn PDF document text
    • https://stichtingech.org/ckfinder/userfiles/files/74074762297.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=best+screen+mirroring+app+for+android+to+pc+freePDF link annotation
    • http://www.cst.rnu.tn/js/ckfinder/userfiles/files/tewovusup.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_off0000e98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A4 10968 bytes
SHA-256: c75466b17c2cce099cb7acfb4141fec7dc274dbea6ab532b461bde64f8b0c667
font_02_sfnt_off00011ae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE8 17144 bytes
SHA-256: 5ec8176a7501719f360aa2f23f4a9d1cf7b48bc154ac1342c1485065e9096286