Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4de95022d288313…

MALICIOUS

PDF

75.8 KB Created: 2021-09-17 01:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 74dff2843e96cf89afd15c6c19557cd8 SHA-1: bc292a6c15b045bbaa22ec85097f62a132c61711 SHA-256: b4de95022d288313ef38df39b75edaebb01379e3d7f06dabbe317fe08948818b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating a malicious intent to redirect the user. The ML classifier and ClamAV detection strongly suggest this is a phishing or trojan PDF. The embedded JavaScript likely facilitates the redirection or further payload delivery, while the numerous URLs point to a link farm designed to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=android+usb+webcam+pc PDF link annotation
    • http://dbexpertise.fr/catalogue_dynamique/file/58332480121.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/xerozorulunanufid.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/53225836987.pdfIn PDF document text
    • https://alev.az/userfiles/file/zobivizupafupuwitutisar.pdfIn PDF document text
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/46141941949.pdfIn PDF document text
    • https://paramourpourbebe.bettygagne.ca/userfiles/file/bozudidujev.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/ziridilofuwuzisadokexon.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/pejuxobolujewosomikaribe.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a774152265---vifelabapufuwega.pdfIn PDF document text
    • http://jpsacademy.com/slbdavbatala/userfiles/file/87455377948.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/xoratexuwekivemotir.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7003416439.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/41761249330.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/79076451858.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/fiwix.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/93923911237.pdfIn PDF document text
    • http://boki.hu/editor_up/xewutovesoval.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/xowufoxupafugetowu.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/zumobakupitute.pdfIn PDF document text
    • http://djapm.com/userfiles/file/masiludidomumuxa.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/zonawapoxutorunobadi.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/65037719062.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_off0000c538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC538 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4A 16836 bytes
SHA-256: 85d4376069c4fd34e2c71c820ab93f3b65753000ebe556fe2ee4c113b90e38b9
font_02_sfnt_off000108cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CD 10836 bytes
SHA-256: 354389afb23f3f70969a366d0b13ae9de62343db51ad394ebd0b4c2ed249873d