Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cff4679ee284e05…

MALICIOUS

PDF

69.9 KB Created: 2021-09-27 20:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1eef9da64600a273101284c9ef80c78a SHA-1: 34e77a8ae6afc7eef0087d2f582b27d1c5a417a3 SHA-256: 3cff4679ee284e050400d5a8c6fbc85133b1ecef6d9fce87333fe975510059e4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://archism.ru/uplcv?utm_term=how+to+logout+from+android PDF link annotation
    • https://kfk-dekoration.dk/images/uploadedimages/file/4345675184.pdfIn PDF document text
    • http://kisito.com/userfiles/file/xatuxewekateja.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/19318531388.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/liziwaku.pdfIn PDF document text
    • http://cermak-expo.cz/data/files/file/rimijedarapejof.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/41867858983.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/561ec77ffcfc79218ab5ec0542b31998/67527896167.pdfIn PDF document text
    • http://buddhavihara.net/userfiles/file/5516873185.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/pedupogoge.pdfIn PDF document text
    • http://furniture83.com/upload/files/buzapitudonafo.pdfIn PDF document text
    • https://koratspring.com/upload/file/tafozavesexubalalubup.pdfIn PDF document text
    • https://kingdom.vn/userfiles/file/zofatipomekuwowatobepuj.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/wibadobadesixezoboxuvivip.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/wetopogoxomemijek.pdfIn PDF document text
    • http://alltechsro.cz/files/81078107435.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/48843699169.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/4787795869.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/4838550014.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/46a2ed3c48f504eefe9a01660ca0dbd5/44174345928.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/bigaxob.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/63197964360.pdfIn PDF document text
    • http://ristorantebiscione.com/userfiles/files/90294572557.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/pekusolesok.pdfIn PDF document text
    • http://naturpix.ch/cmsimages/file/26284806997.pdfIn PDF document text
    • https://palet-school.com/files/files/lukimulirosafoguduli.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/11706709317.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_off0000b367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB367 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7E 10576 bytes
SHA-256: 8ddf3627fa16a785573a7bf0b85aa84f3e3e21b20935cf823b49fe121c370551
font_02_sfnt_off0000e35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35B 14552 bytes
SHA-256: 0647e1d181cb10a42e3235de5d01cbe89a20062ec8eb1352a0bf57c9098bdb06