Malicious PDF — malware analysis report

Static analysis result for SHA-256 93d8bf582c263edc…

MALICIOUS

PDF

68.2 KB Created: 2021-10-01 19:28:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 9442bb8f4f8d3d0b885580a5f534915e SHA-1: 86d5e86ddfff10c4c043db7b60c14e93252e4e44 SHA-256: 93d8bf582c263edc2345c8bafd57f2864ab674242a0d9ec7b63e42ed9191ff9b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links on low-reputation domains. The presence of embedded JavaScript and the ML classifier's high confidence score further support the malicious classification. The primary IOC is the URL that appears to be a lure for a music creator APK.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cructi.ru/uplcv?utm_term=music+creator+apk PDF link annotation
    • http://arndt-fahrschule.de/userfiles/file/mifoduzazogodinukagepu.pdfIn PDF document text
    • https://areicon.com/images/file/sodumuxijijipozupepoz.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/misuxumesorogomakuronin.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/mezafu.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/fefotogubuneduwanibepa.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/7321889527.pdfIn PDF document text
    • https://vitanov.rs/files/37984946033.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/39428235220.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/kerapunovabivipidolijan.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/vediwojiz.pdfIn PDF document text
    • https://unovosti.tv/ckfinder/userfiles/files/muzipenovaburenofu.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210914053112.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/vixunagapejexifeka.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/vifelatisedefaxo.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/sejodaxofajefu.pdfIn PDF document text
    • https://svenjakretschmer.com/ckfinder/userfiles/files/67779583314.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326730dc70b---38905603172.pdfIn PDF document text
    • http://novena99.com/uploads/files/202109130718305738.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/30823145578.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/21590804960.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/kileweronogopozebow.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/56378324044.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_off0000aceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC502 10404 bytes
SHA-256: 176d9b8a600aa70e04f02d7520243f39d14abfa6ae48cfd943d2238a25f660f0
font_02_sfnt_off0000dcc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC2 15296 bytes
SHA-256: de5ceec488da0bc8ec1a1804b7436a83344bf87fb1514a83c4e0760c2a39bd4d

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