Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7f15441b97dfc63…

MALICIOUS

PDF

97.1 KB Created: 2021-09-23 15:02:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a1550bbdb5d2328be57632163bf7cbb6 SHA-1: 5ba65e8f22030324c75e952aaf9d665aebbff32b SHA-256: e7f15441b97dfc634ab9fa262cbfbb73c2dd39f498df3c8a7bc0a76595fe7b0e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The presence of numerous distinct domains hosting PDF files, combined with the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic, indicates a likely attempt to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it may contain embedded JavaScript or exploit code to facilitate further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.
  • 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://thuaphatlaihanoi.net/uploads/files/13262975380.pdf In PDF document text
    • http://villalapinetafavignana.it/userfiles/files/wezixagizaloxikinetuwugu.pdfIn PDF document text
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/52388477855.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/bapepuduxun.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/15467045433.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161453fd56f335---64561057627.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/37757086088.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/6369719192.pdfIn PDF document text
    • https://aaaxxion.info/images/file/55599643658.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/fademewuko.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/66338898339.pdfIn PDF document text
    • https://euinsuti.ro/app/webroot/files/userfiles/files/zaviluzekabixufozisi.pdfIn PDF document text
    • http://americasbestwingspa.iorderfoods.com/uploads/files/5482682373.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/20478746098.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/zigufonabokuruvaden.pdfIn PDF document text
    • http://raovat.coi.vn/uploads/userfiles/file/xubazefokodavubufujezaw.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/268253450.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210913_DC0280530A806C5B.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137653c5cfaa---pawofasopesema.pdfIn PDF document text
    • http://www.globalnautique.nl/upload/files/81455062205.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/363380883.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/63323500407.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/50796608050.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/lavununeri.pdfIn PDF document text
    • https://alicantea.centralcms.cloud/galeria/files/59913311715.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=beat+audio+for+androidPDF 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_off00011646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11646 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012e5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E5D 10284 bytes
SHA-256: 88b32ddfbf8013513d12b82d512356a8768030d9fc19c51dfc01e4b48bdd4088
font_02_sfnt_off0001459c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1459C 18780 bytes
SHA-256: 03ddbd97a8d52339b0333d5a45912b4842f2ea7231f215aaec2c071a742aa60a