Malicious PDF — malware analysis report

Static analysis result for SHA-256 be19dba5b79fe70e…

MALICIOUS

PDF

80.7 KB Created: 2021-09-20 10:12:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 998126382df1dedcf1274469e30296ef SHA-1: 6a28b2c7d0b8f57a5e66d68cfe33ef8ac963827c SHA-256: be19dba5b79fe70e804c9db6b09ff81cec64f4f6a16e0c6b388a44157eafbcf3
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are on disposable domains and appear to be part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=download+n+track+9+apk PDF link annotation
    • http://pumarecovery.com/userfiles/files/96514753740.pdfIn PDF document text
    • https://raovat72.vn/uploads/news_file/rebebagukegigipo.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/1197333584.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/zoziresesarajuxosewax.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/nopizo.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/tewitejadofoxufakane.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/ruzomubuvekigeri.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/92563821346.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/78208408420.pdfIn PDF document text
    • http://sakem.org/userfiles/files/31330333386.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/5960528873.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-04/2109042043257238217gdtrtxmnmk4.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/genizarepukonewutosove.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/tudigikomipe.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/belazev.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210904054850.pdfIn PDF document text
    • http://www.sanjuktabanerjee.com/fckimages/file/xodivodonubigutuwegali.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/99486715047.pdfIn PDF document text
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/lexov.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/gatukipuworowajuvo.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/68430781600.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/tizefazavuru.pdfIn PDF document text
    • https://360clothing.indicsys.com/home/www360cl/public_html/uploads/images/files/21315446575.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/11786217106.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_off0000d8fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FB 16992 bytes
SHA-256: ec532dd67b718ab23869b8855832821262274b22a6671ac5dd53fcf8fef6cc18
font_01_sfnt_off000104f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0E 10460 bytes
SHA-256: d5995310a61958730f37b6d8757eb4c500ae8368c167df8449214c3a0845d2b4

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