Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3eaa103af002958…

MALICIOUS

PDF

81.9 KB Created: 2021-09-22 21:32:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8561f6f2b1a7bb6ea6b8e62d05e2bd8e SHA-1: a9f8f923efa70381d1693d0d99d27baa250b8a4f SHA-256: a3eaa103af0029582fc3499a0cb8ced5bcaaf42c1e91be72a4e7316017904187
126 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. The PDF structure itself appears to be exploited, as indicated by the 'PDF_DUPLICATE_OBJ_BODY_INCREMENTAL' heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://hanlacsclub.com/ckupload/files/vawodefebipavixaboru.pdf In PDF document text
    • http://wonsakai.com/uploads/files/mokevazomogotofojorefed.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/10891165246.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c94ae04977---sibalox.pdfIn PDF document text
    • https://duel.pl/userfiles/file/rulanunewu.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/37856584571.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/88739696825.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/tapizumapojojemu.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/33998611664.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/76731897896.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/30197362507.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/litaluzav.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/80810018675.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/38899970392.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/lefuzufajosopite.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210920090759.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210908035035.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/31919750786.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/41666043208.pdfIn PDF document text
    • http://imdad-egypt.com/userfiles/file/kefezavusuwanadi.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/vasafiwubagukim.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210905192936.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210914031718.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/nufuvuzasukuju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=can+you+send+a+delayed+text+on+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_off0000d5fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0E 19704 bytes
SHA-256: acd5b8768519f7094348531427a90de9b96629cd99faf944ca14d2bbac73035a
font_02_sfnt_off00012122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12122 10588 bytes
SHA-256: 68504b52b00f2d7e629cfbd0831e4050d76e982c7255a4fc9738a99d719989f4

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