Malicious PDF — malware analysis report

Static analysis result for SHA-256 27f1ae80b2351a56…

MALICIOUS

PDF

82.3 KB Created: 2021-09-22 20:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fc65e35808f6b8d3167723e671ba179d SHA-1: 6491ed7b2864b8a370c25eb04236b91970eb0c19 SHA-256: 27f1ae80b2351a56a3fa3042d686bb819cdbf0d10d2c5c586f8a5798678f5fc8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous embedded URLs, many of which point to disposable domains and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM suggests a deliberate effort to create a large number of links for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=how+do+i+get+to+my+email+on+my+phone PDF link annotation
    • http://studiolegalezullo.eu/userfiles/files/bakulozozujupori.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/24849311925.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/80911663699.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/sdjehuvdrob5tu7bp7no8806l7/86248119704.pdfIn PDF document text
    • https://onecre.com/images/content/files/rugarotekuwijulafozo.pdfIn PDF document text
    • https://edarky.net/data/file/36167226113.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/33193900167.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/fazexegikikodegab.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/25943337161.pdfIn PDF document text
    • http://life-homeshop.buyout8.com/asset/uploads/files/buxasaxijemixejiropumewuw.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/77723410241.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/72723526966.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/malimevusiso.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/17752336852.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/59496626459.pdfIn PDF document text
    • http://mueblesdepladur.es/1/userfiles/file/zudojororulixorevibebepar.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1614895ee47684---61163819691.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/sotiwozebazarosotajepuza.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/46035363835.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/surobinofazogenaguxosezog.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/50318778507.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/sokutodosegi.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/4626181494.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_off0000dc73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC73 18068 bytes
SHA-256: 1d2decbc026854da2ae21c6e4736cdb0881cf0a3f96b8dda9acebe31462ed838
font_01_sfnt_off00010ba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA3 10760 bytes
SHA-256: 27de8d26f4319eaa703256c41aaea4a434622d1327b96a486887333c1ddde336
font_02_sfnt_off000123f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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