Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d45abc5f26d4776…

MALICIOUS

PDF

80.9 KB Created: 2021-09-17 01:00:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 95caf7c253a2ce7501c0fbfb9d447946 SHA-1: f8f9be76704d177ba9b6ab506627b015e39905c1 SHA-256: 3d45abc5f26d47766527038d4f3eab86f8ad98845f4245b7bf0923911cec8952
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URLs, many of which are part of link farms on disposable hosting, suggesting a phishing or scam lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attack pattern involving the exploitation of PDF vulnerabilities or social engineering through embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • 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.
  • 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://wastran.ru/uplcv?utm_term=disney+infinity+2.0+apk+obb PDF link annotation
    • https://bocion.com/ckfinder/userfiles/files/6095316599.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/13518763460.pdfIn PDF document text
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/rugopupenokibagofopo.pdfIn PDF document text
    • http://chikatere.com/Upload/files/pakiterogudefamenubixurun.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/ximepufetov.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/pabupinofuvu.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/donupidaxewiwobegi.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/3458410421.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/joxavekuxuxopujif.pdfIn PDF document text
    • http://smm-mm.com/uploads/news_file/47022456474.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612fca67aa70b---94013107066.pdfIn PDF document text
    • http://itena.si/uporabnik/file/pagapifomisawakerukagur.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/xobunibekeviseveno.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/30298081387.pdfIn PDF document text
    • http://brukbet.com/user_images/file/56344677455.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/zetexexupigasidixexiw.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/guzedotuwugabeb.pdfIn PDF document text
    • http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/84130598666.pdfIn PDF document text
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/11596339598.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/76289855214.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/zedirazogitusek.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386ed1dff48---92520008030.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_off0000d410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD410 10860 bytes
SHA-256: f2354455b1bd8632d1c152bf970e0b1d0ef2c08a1df930706242089ec7f3de72
font_01_sfnt_off0000ed2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2B 18344 bytes
SHA-256: 1b069a0e131bf9b9a6fd40d5b0346188016820618a50749ae4cf996b5fe1cef4
font_02_sfnt_off00011dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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