Malicious PDF — malware analysis report

Static analysis result for SHA-256 e68a45d18ae7edfd…

MALICIOUS

PDF

75.8 KB Created: 2021-09-26 21:43:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4189561c7456f0518d1acdd2ff2cc587 SHA-1: d2a5a20e96b9a89b22226f6653952ceab15d7722 SHA-256: e68a45d18ae7edfd5dbb5b253a79e5c5e96643d10ffe0e796d586627f949c3ac
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 part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via the embedded JavaScript and external links. The primary lure appears to be a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://chcial.ru/uplcv?utm_term=vinnaithandi+varuvaya+movie+hd+1080p+blu+ray+free+download PDF link annotation
    • https://biocoils.com/img/file/40168601852.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/devoj.pdfIn PDF document text
    • https://davnosti.ru/upload/domibegapuwerudi.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/sevavofesal.pdfIn PDF document text
    • https://funke.be/data/file/88144631127.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/bomibepi.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/81703901115.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/89480878839.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/8451748017.pdfIn PDF document text
    • http://dytac.hk/userfiles/80065700466.pdfIn PDF document text
    • https://kameramuzesi.com/upload/files/wiripawavunum.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/46178820378.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/jovut.pdfIn PDF document text
    • http://aurastaffing.es/upload/file/26117457809.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/mezuzatakowowodalasilejip.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/73872672413.pdfIn PDF document text
    • http://sanjarbek.uz/userfiles/file/87981171037.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/9226cc2188dc049c6da711457e1f0749/96483312652.pdfIn PDF document text
    • http://rhoptik.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/38582829396.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/tijome.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/49749255774.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/jesawateveritiraledak.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_off0000ba87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA87 19748 bytes
SHA-256: ab9ad867588c549b9b805936b7720b8733df52bfceac8d7d0d658091c969c49f
font_01_sfnt_off0000ee3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10653 11452 bytes
SHA-256: 12ef8f8192e11949472428492a956aabcf406996c7e8b0302a4d88a95284c268

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