Malicious PDF — malware analysis report

Static analysis result for SHA-256 feb1d7189c1ea658…

MALICIOUS

PDF

85.8 KB Created: 2021-09-14 07:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 11e74f77ffbf5acacdfbfe36dbd62d21 SHA-1: 79e4aaef356a647e78e2ef65d8eb09d764545d66 SHA-256: feb1d7189c1ea658902b88f59a8cfded7d1adcdb16535faa64b3cb372c56913f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and are flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware hosting sites. The presence of embedded JavaScript suggests an attempt to exploit vulnerabilities or further obfuscate the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://websurin.net/UserFiles/File/wegivinefevovagiw.pdf In PDF document text
    • http://andlupa.com/userfiles/file/18128174672.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/78913110024.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/vujonobamititenunarubivad.pdfIn PDF document text
    • http://proclima-membranes.ru/userfiles/file/sajarijojepi.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/98305282750.pdfIn PDF document text
    • http://master-stroi76.ru/userfiles/file/gafevofesevifuweponimu.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/raludurifojikazebe.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614008e68c4c9---didatetamopipobosipimobor.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/34019779964.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/52927573055.pdfIn PDF document text
    • http://smm-mm.com/uploads/news_file/22227511427.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/83847048200.pdfIn PDF document text
    • http://eko-uklid.com/files/file/nufivafad.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/tipekiwafawowatirodadivo.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/99012898234.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/lakapa.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/virulizavizisinopukexudu.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/koforekupezogelavemuwus.pdfIn PDF document text
    • http://qdxqw.com/uploadfile/file/85380355789.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b75052b28d---23398755700.pdfIn PDF document text
    • http://sun-apartments.pl/data/pages/faloguroku.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/67437319977.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=android+todo+list+appPDF 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_off0000edf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF6 10232 bytes
SHA-256: 22e152b3feae1861240b4895329762d7ac5e863af22e56868ca6fb5ada9ff707
font_01_sfnt_off00010501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10501 17368 bytes
SHA-256: 937b5b49e8bb319ec1ae63e8c974aae3c7f0a27591c0a40f882e1e86da9d3aa1
font_02_sfnt_off00013220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13220 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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