Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7efb416c4846a51…

MALICIOUS

PDF

69.5 KB Created: 2021-09-24 17:23:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a553a3e93464bd2628b973a661885e12 SHA-1: 660f78faa90c6e357d40b7733bfd953d30a31251 SHA-256: d7efb416c4846a5197481535fc45beffd710ace66d3aa5bbeff0b3b429fcbae9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://coretry.ru/uplcv?utm_term=twitter+running+slow+on+android PDF link annotation
    • http://bentleyplemtech.ru/userfiles/file/wobixum.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/lalajoporik.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/visudilivarelatuwik.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/kisadesalovudola.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/firebe.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/tofagagil.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/50028551528.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/9b586bb4bc72bbfb88098a48f0640583/benisetobeveko.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/zizomas.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16132fc595443e---17541232196.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/44633206458.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210923_B61D9023A8884DED.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/lamabaj.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/xanekilonozijilat.pdfIn PDF document text
    • http://coca-colalife.eu/userfiles/file/wexujuwuvabanuviveda.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/97282307892.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/jigikizizofipux.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/18543752492.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/27279595033.pdfIn PDF document text
    • http://kisito.com/userfiles/file/lovijabuxamubepobune.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/96982092274.pdfIn PDF document text
    • http://www.grifin.sk/files/2847232697.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/64806580163.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
stream_003_off0000b060.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xB060 10572 bytes
SHA-256: 1119c458040c4ff78f03b4970d0286527f44fbabbd96a6f23dea9e74c8cff718
font_01_sfnt_off0000c877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC877 15548 bytes
SHA-256: 0453acdef5b0b9e07829c5eba6c5a301058dbd425537e06b50f61c7ca91207cb
font_02_sfnt_off0000effa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1