Malicious PDF — malware analysis report

Static analysis result for SHA-256 98afe2bfde64efda…

MALICIOUS

PDF

77.6 KB Created: 2021-09-19 07:31:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cfb12c46de9b550cb5f7ca8e7d2313c9 SHA-1: 32dd9196d4beccc568e4c1d2d13e3175aadb7c38 SHA-256: 98afe2bfde64efdac44602439623cec469f84c3f411a6aead0ebd50daabf382b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The PDF also features a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing attempt. The presence of embedded JavaScript and numerous external links indicates an attempt to lure the user to malicious content or exploit them.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://rent-lease-no1.com/userfiles/file/20210919044208.pdf In PDF document text
    • http://lngpetro.com/userfiles/file/volibomube.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia/files/32288296569.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/58059316606.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/buzajimafenonebuxuja.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210911145304_wz1x0s.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/luxoko.pdfIn PDF document text
    • http://chithanhplastics.com/uploads/userfiles/file/48087328324.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/dowixutine.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109111956238658.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/rotixigasefirepopap.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/gowitadalara.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/mixobadolapidasekejameb.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/xijagiragirozunulesireku.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/xirilusawifafubenugupa.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/bd92517d54d208b404f145485913fc8b/kuxirabarepixofikapem.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/wanowodafekevafo.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/7328237650.pdfIn PDF document text
    • http://privateeducation.sg/verzsape/demo/upload/admin/files/pusiduzovuk.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1614317e9f074a---batalivizonemukifokureba.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/10313185297.pdfIn PDF document text
    • https://aecvfcom.nrgence.com/upload/userfiles/files/38350168418.pdfIn PDF document text
    • http://szm.hu/userfiles/file/77904611128.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=bonfire+forsaken+lands+mod+apkPDF 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_off0000c707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC707 19628 bytes
SHA-256: 1f09446d622914ee57bb7b0728ece29d02e2976e15f72dcd6db0a2259e486569
font_01_sfnt_off0000f8a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C0 10708 bytes
SHA-256: 7564302aebbddc66f335f380a9a82d578f95c0ad3fa34483c87e64f4fe2342c9