Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3d9e6c41abf94e2…

MALICIOUS

PDF

78.4 KB Created: 2021-09-16 19:30:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 01abed1af822a8f273905335e488d4c0 SHA-1: 42b53b6f2583998f05d21bb83ca4bb6c4bdb299c SHA-256: a3d9e6c41abf94e2fe02940f7536b0fe0aba4ffbcb9929f38d33f89964eaffd4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is identified as malicious by ClamAV and an ML classifier, and contains numerous embedded URLs pointing to disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on potentially malicious hosting. While no scripts were explicitly extracted, the presence of embedded URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://garglob.ru/uplcv?utm_term=cara+edit+foto+bulat PDF link annotation
    • http://cungcapbaoduongcuanhatban.com/upload/files/63706842684.pdfIn PDF document text
    • http://hstairan.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/30548563769.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/zemirij.pdfIn PDF document text
    • http://eatorhours.org/e-bussiness/fckimages/file/15835400901.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/38423751469.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/vibudorerupitubu.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/93232692338.pdfIn PDF document text
    • http://premiercontainerlines.com/media/ftp/file/voxixosed.pdfIn PDF document text
    • https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/dedan.pdfIn PDF document text
    • https://yensaovinastar.com/media/files/zetatowerulenasatikojup.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/pekegegalitus.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/fidupev.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/3398596537.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161312cc795359---telijasofurejekutepiv.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/pubaselijivasojupi.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/wowikikigijikexesuzogen.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/regamadejilemopug.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/vavewewupi.pdfIn PDF document text
    • http://headrepublic.pl/images/files/43045699822.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/15776151845.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/48949730106.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/jetefefufiwip.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_off0000d304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD304 16284 bytes
SHA-256: 955673cb2138ab9456fb6091fb7619eb46f9efcbe95300a31d44756a22cc20d5
font_01_sfnt_off0000fd31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11548 10348 bytes
SHA-256: 26f46cbae4e748e485c4f46ecec2801cfbfea08c2857b849df74b72e0c3d195f

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