Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb4efaf2fd53949b…

MALICIOUS

PDF

71.4 KB Created: 2021-09-30 19:57:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: b8c76cfbe4d9ee584a60bb87890c67cf SHA-1: 9d8aff6749f99ff106e5decf723a21592eabdfb2 SHA-256: bb4efaf2fd53949b9e92a6d38debe4f72bc8c02d01155119beaed7f391404413
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 disposable domains or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://ketchas.ru/uplcv?utm_term=btd5+unblocked+66 PDF link annotation
    • http://thaisomboonautopart.com/userfiles/files/wonigolomak.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/2265aeffa85b2ed7f27f422ed8d62339/1183814483.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/gafaburanakovodox.pdfIn PDF document text
    • http://373113.linker.tw/files/fofilule.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/72145053016.pdfIn PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/rurinuwejalokiluninokas.pdfIn PDF document text
    • http://indemo.pl/Image/files/dugajajagebegozadu.pdfIn PDF document text
    • https://infotechsystemsonline.com/ital/www/img/file/74594839112.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/tobimudetolofupo.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16142b0e167502---jupojagivisevisawaram.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/jinapidi.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/63467815817.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/vadukokidofifabagugutusa.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/70177338102.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210906065303.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/zarufuraginudofipar.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/wosipelefusenoveli.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/wogofisi.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/redifijuguxirekulezorog.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/4026932600.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/taxiwow.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/rokilubopo.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/49998483704.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/93887230613.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfc8e7d096---rawitukafe.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_off0000b300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB300 10528 bytes
SHA-256: d13fc0f7ccb86075290b42c176a650edb073ac51b67093c684d8923483b20a06
font_01_sfnt_off0000cb23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB23 17584 bytes
SHA-256: eaa15353b99288088e10bef1e610318141473c5cca36da9a19e79d91938aa767
font_02_sfnt_off0000f846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF846 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1