Malicious PDF — malware analysis report

Static analysis result for SHA-256 290a9cdffde67e68…

MALICIOUS

PDF

81.2 KB Created: 2021-09-10 16:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8507c51f394080f73b353f4411548fba SHA-1: 09bee2834eefdc476e5fa23009d784565dd32e08 SHA-256: 290a9cdffde67e68f462f3a145aff458577d55fa4934fb5f93a8bdc7d6af67c4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links to external, potentially disposable domains, suggesting a phishing or content-scraping lure. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://ozora.schaffsen.com/contents/file/6920408582.pdf In PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/popuveja.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/72488503498.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/siwuzobuxu.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/202197122212644.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/50499578339.pdfIn PDF document text
    • http://mrhobbscoffee.com/images/uploads/file/fosixukugub.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/60060863572.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/47726031745.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161353e367aa0a---65929270751.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/videnekujamorip.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/97683620282.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/dutagenabegetijite.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/11300382342.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/73020479408.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/razuzajilidujeximofaji.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/tesuwazokudelur.pdfIn PDF document text
    • https://omegaplus.bg/uploads/pages/files/jitujamov.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161389866c3641---xizigizazadevaxuxuzuru.pdfIn PDF document text
    • https://tmtteks.com/files/15494659763.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210909222752.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/tawogubifatuge.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/romugepeputapadinokakuri.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/xejudukalotobiwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=android+pc+suite+for+windows+7PDF 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_off0000d903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD903 10620 bytes
SHA-256: cc98bc28a58b8a6fa9084ba4c58674c7291f7778fc8d226f2bc784b0e47682c0
font_01_sfnt_off0000f196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF196 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A8 17716 bytes
SHA-256: 4fa6366b9e39cf09a6d24439a6dd96205d8bdfcbcd4e43aae7ad76ec4118aa9d