Malicious PDF — malware analysis report

Static analysis result for SHA-256 8779c672269dd364…

MALICIOUS

PDF

72.2 KB Created: 2021-09-17 10:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: badaf9a1924c085714c1269b50329021 SHA-1: 522f31372dc4f79b914c34aa393bd29449b17a4e SHA-256: 8779c672269dd364fe741a684cee81578f084df7507fb9d521c865ef6351f697
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, indicating a malicious intent to redirect users. The ClamAV detection and ML classifier strongly suggest this PDF is a phishing or trojan delivery mechanism. The embedded JavaScript likely facilitates the redirection or execution of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://oniceh.ru/uplcv?utm_term=ninja+fruit+mod+apk PDF link annotation
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/97704177305.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/xevonowoxusodimubanop.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/17591541022.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/46962188763.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/rupimasusirapeferi.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/17633700196.pdfIn PDF document text
    • http://evola.it/userfiles/files/pemini.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/34161822289.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416ef4e227e---83535509546.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210904211242.pdfIn PDF document text
    • https://zagi.hr/files/45637456850.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/45037053471.pdfIn PDF document text
    • http://www.aaar.cat/assets/js/ckfinder/userfiles/files/68831027191.pdfIn PDF document text
    • http://swapnakoodu.com/fck_uploads/file/rifakedurovuki.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/tifukilulebupabixijij.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/1491761975.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/jikipufotesedoxuvil.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/63782710479.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/46711482379.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/tegorosa.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/18400525919.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/89863712640.pdfIn PDF document text
    • https://robindayne.com/ckfinder/userfiles/files/wobemutisu.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de9e0021f3---28329569932.pdfIn PDF document text
    • http://topaslt.com/userfiles/file/muravosuponategenekudo.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-1/20210901153529934186.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/8457280870.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/ruxomeluzafepawezojez.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_off0000bb6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB6A 15544 bytes
SHA-256: bb8cfe9436db023d71b95ce77672ef46a7fe53efdc5d7a1992101b0fa8714154
font_01_sfnt_off0000e2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000faff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFF 10612 bytes
SHA-256: 9e5ff3a37f214920c355843b989d6ee2c3aef0b3952e2b654203b0ef01be82ec