Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1ab681292cef940…

MALICIOUS

PDF

83.2 KB Created: 2021-09-18 19:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b2f77e1008a54bbf94eee21bbfa9b646 SHA-1: 9fea1fba9096c6f274d451e556950da8600bee89 SHA-256: e1ab681292cef9401a4b26e10931ee8309e594b94da8008b24e18fd0d34882b2
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. Heuristics indicate it's part of a link farm, with multiple external URIs pointing to disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/uplcv?utm_term=fifa+12+mod+apk PDF link annotation
    • http://cachnhietwin.com/luutru/files/81212781903.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/ravuj.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/ruliwalawe.pdfIn PDF document text
    • https://chineseclothingonline.com/File/42321080801.pdfIn PDF document text
    • http://angelascanu.it/uploads/file/17104894356.pdfIn PDF document text
    • https://eklyps.net/images/file/18560186103.pdfIn PDF document text
    • http://markone-tools.com/upload/files/86015673750.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/48050064388.pdfPDF link annotation
    • http://nbc.ua/design/pic/file/tukopovopale.pdfIn PDF document text
    • http://vinaaquachem.com/uploads/files/69065461624.pdfIn PDF document text
    • http://jar-ted.pl/file/tabixikedofafizuva.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/18248650371.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/44497424842.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/fuzenolumepulodoru.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/11536689570.pdfIn PDF document text
    • https://faguaflowers.com/images/admin/file/jidemevebomosanofo.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/subaw.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/5418979249.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/42567657630.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/lanilisukapimulujimadeg.pdfIn PDF document text
    • http://gurgaontaxi.com/pa/trainstation/uploads/image/file/70575639562.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210917082210.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/74216056455.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/337bc93924116390f95c4feda26eb3bb/fomirewaliviwuf.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109100910507246.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/ximiboforujenu.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b484731758---84260633736.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_off0000e1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E9 17784 bytes
SHA-256: 61cfbc970f6cc75ff62179390636c27554d5f86cc7009c753730f88df95c38a2
font_01_sfnt_off00011013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11013 10252 bytes
SHA-256: 8b6b1baf1831d2f3f3682b37edd260fa969fc44a6b3a9e3d37fccfcfcdbdb7a2
font_02_sfnt_off00012722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12722 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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