Malicious PDF — malware analysis report

Static analysis result for SHA-256 69765b0160460908…

MALICIOUS

PDF

82.6 KB Created: 2021-09-13 22:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6db2d5871c06673a2efc31edef5e3d94 SHA-1: 9859c52add5df8cba24d3179d69372157fb6f0b5 SHA-256: 69765b0160460908bde4f2a000bde2a0ba47fed64a6039e255c4d40c4a7e1d98
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://postelezmasivu-brno.com/ckfinder/userfiles/files/wezogesate.pdf In PDF document text
    • https://chingchia.com/uploads/files/202109042007566483.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/3342475810.pdfIn PDF document text
    • http://rem-stroymont.ru/img/file/lesapabegoraron.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/bokudewasuzopi.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210901_60D60F135902A6A1.pdfIn PDF document text
    • http://myagreement.com/UserFiles/file/pugasup.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/liwegigo.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/dujiwujujamowu.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/71838892205.pdfIn PDF document text
    • https://xcheck.vn/uploads/userfiles/file/52106406965.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/loluwiwuxegoje.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/libisivatarew.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/fuxuwi.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/73684548018.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/duxiradonafujokige.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/1980003601.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133be05a4abe---1037906349.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/sanajezaro.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f1f3dd39f---monudipazozapatumek.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/rubofuxamokijazamosuloze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=common+android+lock+patternsPDF 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_off0000db83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF395 18500 bytes
SHA-256: 944bea7c8d27dcabcdb1a4780e588458ee0cf572323087c187fc5c4219491865
font_02_sfnt_off00012461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12461 10796 bytes
SHA-256: 483ca86e1fcc90b4c92d9555d3af658527cb8be1a4c44be4b754b532f3a9834a

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