Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a553164beabb547…

MALICIOUS

PDF

81.1 KB Created: 2021-09-19 01:30:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1a573cac5669f78a03fb6f530e01820f SHA-1: d4740466b1c389324decb39dd1e279435b47ce2e SHA-256: 6a553164beabb547c77023582569c99196919292a2a018114723a45f89bac745
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users to malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://huntic.ru/uplcv?utm_term=browsec+apk+mod PDF link annotation
    • http://strap.sk/uploads/files/famoxoxex.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/ligeduxoweladivigataf.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614052bb16fe1---zomajamesu.pdfIn PDF document text
    • https://ladida.asia/sporlegen/administrator/imagetempfile/64589407636.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/74373347884.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/zisegi.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/26561484821.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/22055473266.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/vonopilevimopisubepipuw.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109062032016179.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/lufozewit.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/30059651167.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/34590529233.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/woremokekuxutu.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/girewarub.pdfIn PDF document text
    • https://tunguoilon.tunhua.vn/ipp/images/uploads/files/30476028375.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/3049151569.pdfIn PDF document text
    • http://4bx.pl/public/file/bawakojave.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/muxudikefukugagilikun.pdfIn PDF document text
    • https://pasarantogel.com/contents/files/89082216645.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/zebavujomawaruf.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_off0000d002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD002 20868 bytes
SHA-256: c97330ebe0ba250a4378b70d374ef3bf2fc4fde049c606a57e258e576ce372c3
font_01_sfnt_off00010716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10716 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2D 10568 bytes
SHA-256: 933259abbbfb3fa37cf33e4cdb37719ce3430cb0ed6a2b374de5e80e3cfda946

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