Malicious PDF — malware analysis report

Static analysis result for SHA-256 d54277e7da17f7c2…

MALICIOUS

PDF

76.5 KB Created: 2021-09-19 13:48:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1b1f39e04e48b7b04d8eca33f1ace605 SHA-1: 3b5a99b2b2f4a1ce9b84204b327b1bd3496c178b SHA-256: d54277e7da17f7c2824a4201c0f55b6ce4062871084f582b9cb8a643ae80b790
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a heuristic identified it as a link farm with numerous external URIs, many hosted on disposable domains. ClamAV also detected it as a phishing trojan. The embedded JavaScript likely facilitates the redirection to these external sites, which are often used for phishing or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://n-vv.dk/userfiles/file/22375650799.pdf In PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/17812049917.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/xibikukibisof.pdfIn PDF document text
    • http://medica-brno.com/files/99506539447.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/9658236837.pdfIn PDF document text
    • https://desco.scp.hr/files/55308997446.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/33334195253.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/19606759823.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/lat8c72btqnvt7vurut22d33nr/jorikep.pdfIn PDF document text
    • https://fong-cai.com/upload/files/33199363659.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135071398f93---25207310419.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/pobem.pdfIn PDF document text
    • http://beta-rc.com/upload/files/57186418439.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/nafura.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/79524099578.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/6476329113.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/subub.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/64904892711.pdfIn PDF document text
    • http://spl-designs.com/ckfinder/userfiles/files/sodapowenuzawawegemap.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/12954473420.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/menawip.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/90228093536.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/puxumunopujobaxu.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/mirazusopok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=feature+phone+emulatorPDF 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_off0000c9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A1 17060 bytes
SHA-256: d434ed69715a64e4add3632875e7d6ca6f6f5a0fd473e7649567ebcdcc0b1424
font_01_sfnt_off0000f5c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C6 10336 bytes
SHA-256: 25ebbd92f98bce28d431b24d8e2e0ec1375e89c26dbabfc6c709ea6ac9d4cc8e
font_02_sfnt_off00010cd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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