Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7dfa5341b773693…

MALICIOUS

PDF

78.8 KB Created: 2021-09-14 10:05:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c73f0da3a52dd3bc5772c556c7432220 SHA-1: e1cc6a323d8c3517497619aa89aac7cda7702649 SHA-256: d7dfa5341b7736932e2dad37ba8e29f0c06e3c235f261574f24fb24dd2ba74fe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attack pattern involving directing users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 5

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=android+bottom+sheet+dialog+example PDF link annotation
    • https://profesa.net/userFilesfile/40809012111.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/nalagokajuxetopu.pdfIn PDF document text
    • http://travelspace.pl/userfiles/file/wewefu.pdfIn PDF document text
    • https://ezokniga.com/uploads/file/vixakigaxarorejopukobulos.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/tiwupaxisupejivokemo.pdfIn PDF document text
    • https://cytokin.ca/upload/editor/file/63148759317.pdfIn PDF document text
    • https://terracell.info/images/file/6054769479.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/nllnv3mvlidtnvqkh45jaonvht/7126421267.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/6834655831.pdfIn PDF document text
    • http://palletgoanloi.com/img-dn/files/87772084544.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6776b407d---29213162737.pdfIn PDF document text
    • http://synowka.pl/galeria/file/dasijosalunevilorinu.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/gegetujifomedeju.pdfIn PDF document text
    • http://vividconcept.in/userfiles/file/11023722508.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/niluwasowesepenegoxoxuj.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/61907811537.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/91449031651.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/suravitisajo.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/xozenivoparewader.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/bisegegakodiregufubuxigoz.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/25734011780.pdfIn PDF document text
    • http://air-ned.com/uploads/files/10137176330.pdfIn PDF document text
    • https://blugarden.eu/file/30798031294.pdfIn PDF document text
    • http://alptw.com/images/files/75161703185.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/46003728975.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_off0000ce17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE17 17752 bytes
SHA-256: e9bab148fb7cc67dba93167387e0862ad81cea9078c8c0a018a6c5154fb7e3d5
font_01_sfnt_off0000fc3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11454 11060 bytes
SHA-256: 0a89ddd3c64986fba79382216b6961cf792892a69857dbae081d0ae17fa66ae6