Malicious PDF — malware analysis report

Static analysis result for SHA-256 637cce806dbe8599…

MALICIOUS

PDF

74.0 KB Created: 2021-09-13 04:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c410cd0ca82ea7b9770db0d89d3e52bc SHA-1: 0ed9d9c7ef030433e31cd434e742c3bb7767c37b SHA-256: 637cce806dbe8599cd3563fe5f0edae1de8f2d4f15b44dcc94b988c86cb1508d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the embedded URLs and the PDF structure suggest it's designed to lead the user to malicious content, likely involving JavaScript execution for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://autosvilar.com/uploads/ckfinder/files/veminut.pdf In PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0250cb5ca---fugub.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210909220327_49zk6k.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/bijileterigofewavijaxu.pdfIn PDF document text
    • http://zzweien.com/d/files/perasapizu.pdfIn PDF document text
    • https://tekartltd.com/upload/files/78323502488.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/64563560587.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/gonafapepifimozadogiwij.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/1756078539.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/29799364444.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/98417089126.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/zojozomos.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/12413813377.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/9937850356.pdfIn PDF document text
    • https://krossi.ru/images/content/files/14185698388.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210906074906443.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/lataweramapafemagevubeguj.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/7080191629.pdfIn PDF document text
    • http://conditum.nl/userfiles/file/morolapikafa.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/27496ea6921c60b49bca8622d245315e/bojovuzekijalawokog.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/gusitiwegavisipawesujuli.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/sowozugilomupupa.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/zerudexor.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/gutuwafebunivigitivawaba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=difference+s10+and+s10ePDF 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://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_off0000be03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE03 10380 bytes
SHA-256: e162125487a9ec4f507477b9e8fac68e33d0bd8c4f5c84cd362817b987cae32e
font_01_sfnt_off0000d5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBD 17172 bytes
SHA-256: e20a885078297149910137e6ef98798a08ce5235923c4a418bc27d8ef872e9bd