Malicious PDF — malware analysis report

Static analysis result for SHA-256 667886e4cbd60602…

MALICIOUS

PDF

73.6 KB Created: 2021-09-20 09:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2392397037e036a7cbdd3c1d77ab05eb SHA-1: 326d55adf88e544533b31261282a8cbb2c50379e SHA-256: 667886e4cbd60602acca144f728c8bb4be8bcc240cc798599aa500b7f64ae712
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, with one specifically masquerading as an 'android update download apk'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://irlanc.ru/uplcv?utm_term=android+update+download+apk PDF link annotation
    • https://aptitudeclass.com/ckfinder/userfiles/files/27311967448.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/lotazepobovavofiz.pdfIn PDF document text
    • http://afro-safari.com/upload/files/zezafov.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/19805001433.pdfIn PDF document text
    • http://dautuck.com/uploads/userfiles/file/rizulomizuxaboleno.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/50197018645.pdfIn PDF document text
    • https://chptravel.ir/data/file/58032067003.pdfIn PDF document text
    • http://knauto.com/upload/file///mawuvusuvinidinu.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/cf8d43678236bbdb1f16cc87cc7afa7e/tijunofikolorim.pdfIn PDF document text
    • http://holzbau-napetschnig.at/moxitosirinogabowit.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/21691045659.pdfIn PDF document text
    • https://kawanmto.net/contents/files/jilogedirovulitul.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210908_101600.pdfIn PDF document text
    • https://vpmemorial.net/images/file/nugigoxozaxudebumiwele.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/73320544980.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/bekumox.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/balasujamagexadako.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/41833170839.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/dekegasiwowesevanitisa.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/32609806952.pdfIn PDF document text
    • http://glassick.com/userfiles/file/4678011080.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/bibafelozoxafigudilo.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/posumuwanik.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/sujugipamapub.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/topunimedunil.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/dulibikite.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/delopasegisusologek.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_off0000baf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD30E 10476 bytes
SHA-256: 79f4036e078ddedea3d451da644ca30231bd631bb646b7b867551667822a178e
font_02_sfnt_off0000eb03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB03 17856 bytes
SHA-256: a81ec4e6393e632446ce06a42667fbe1d01368a49cc10c39ca4f9313b74d132b