Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfe5c7119c57596b…

MALICIOUS

PDF

72.0 KB Created: 2021-09-17 13:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5d3a8af39eadadb76bda0c5c490b47eb SHA-1: 4905b809914e46dc651178dff26579a734ffd23e SHA-256: bfe5c7119c57596b0c2de5e0c404330c069371cfa09307dcdfcb378e10907804
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. ClamAV detected it as a phishing trojan, and ML classification strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9830

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 http://jurabos.nl/include/editor/file/2027309040.pdf In PDF document text
    • http://yung-shun.com/userfiles/file/wofavupigugij.pdfIn PDF document text
    • http://master-br.ru/img/file/vubatijowuforulodusupek.pdfIn PDF document text
    • http://moristas.com/userfiles/files/10581439873.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/rudubuvotusudoko.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/duvigorazadevesefefe.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/45632361896.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/93254fb168ecfc7aab3a930069df0a01/jopog.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/zunexubumumewajapuzadumet.pdfIn PDF document text
    • http://ndt-ultratech.com/files/41004890523.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/laromugodajafifinafupitu.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/69248770741.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/vebezukomole.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/mudadapadovot.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/81691147166.pdfIn PDF document text
    • https://nepalfinepashmina.com/userfiles/file/99469276046.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/44437554514.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/94315207745.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/texuzeg.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/baxotal.pdfIn PDF document text
    • http://simsoncantho.com/userfiles/file/1341313254.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/gexepegigu.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210901_6F1E8E5324C2EDE5.pdfIn PDF document text
    • https://geya99.com/ckfinder/userfiles/files/99757608694.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/22925796920.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/bupobogadirotogugukezoko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=agatha+christie+books+in+bengali+pdf+free+downloadPDF link annotation
    • 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://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_off0000b8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B9 17068 bytes
SHA-256: 85919da869d09a7084b833d43d8bdeefa810d920181fa0b929e0ffe0bbadbf33
font_02_sfnt_off0000fcf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF6 11196 bytes
SHA-256: f47b9e0f3e904982dbfb8f4af2c6b752ce4817655779bdd9e758507715bb6d11