Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f9e5d8929a9d9fb…

MALICIOUS

PDF

80.6 KB Created: 2021-09-19 10:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d2aae82144a69a6db0a39e2739bc891c SHA-1: 6e1ab6a002279aa167c59451a797da92bafc4d42 SHA-256: 8f9e5d8929a9d9fbe89bbaa2f89485e8b8de8aaa1450d9ec47650f934330f000
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://jualumnitoronto.com/editor/uploadfiles/dizodokote.pdf In PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6b9232acf---39006336342.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///88547602417.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/32894923287.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/33451073738.pdfIn PDF document text
    • http://xn----8sbkebltdkywd.xn--p1ai/ckfinder/userfiles/files/xigijusobuxusorinu.pdfIn PDF document text
    • http://c2r.su/uploadfiles/file/2021090710254073499.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/48438186479.pdfIn PDF document text
    • http://pronobile.com/catalog/file/wobisobumelemapetobeven.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/90724387016.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/bekoxopanugemasitipidinu.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/kavolokipinuwu.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/44227531053.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/16556552840.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/zumawugemefageluvijez.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/94029268885.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/29224733071.pdfIn PDF document text
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/13824145126.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/17883575282.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/99018032263.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/gebepadujare.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210905130905.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/fexopemazewapiju.pdfIn PDF document text
    • http://e-hematologica.com/users/file/wejezadozotozexojufolezi.pdfIn PDF document text
    • http://topp.pl/_topp/file/31768479288.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=inshot+download+proPDF 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_off0000d8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B9 10304 bytes
SHA-256: d6eca77adce84e7f049474088fd195400a264b3949317a96869c611a75415baa
font_01_sfnt_off0000efe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE7 17668 bytes
SHA-256: 8e202769427f1f8e46bb4b90486371ba2c294e75655546a899ee4a097465370a
font_02_sfnt_off00011cfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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