Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fd1d49b74182c03…

MALICIOUS

PDF

81.2 KB Created: 2021-09-18 19:02:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7b4d9e54d4355748ad022cd510c74404 SHA-1: bb569b02cd0adb2b1f6b3f8c99e6c68bd6da974b SHA-256: 1fd1d49b74182c039feb33644a4da406b96e2fa0ef262bc41deb97d5376453a8
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. The PDF structure and embedded URLs point towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=vagrant+story+iso+download PDF link annotation
    • http://yogasol.cz/ckfinder/userfiles/files/nogerefulabawi.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/52neaqi6p172rr5lubm3g1mfqf/20689571857.pdfIn PDF document text
    • https://titishop.co/upload/files/33028941573.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/12358848787.pdfIn PDF document text
    • https://360clothing.indicsys.com/home/www360cl/public_html/uploads/images/files/nukujes.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/nuzorulosojofedulifu.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/fupojesare.pdfIn PDF document text
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/66300036926.pdfIn PDF document text
    • http://mothertheresapublicschool.com/userfiles/file/fagotexabularabo.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/49835750503.pdfIn PDF document text
    • https://reclamesticker.nl/images/uploads/file/In PDF document text
    • https://alixdemassy.fr/userfiles/file/94254859018.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/sadovuriperisalage.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/52188060189.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16138ac9c32781---37774930210.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/13471619321.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/54061206182.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/kozumo.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/38934212100.pdfIn PDF document text
    • https://zooiguana.pl/app/webroot/media/files/janidub.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/45456371452.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/mowiv.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/31628485140.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_off0000d587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD587 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED99 19152 bytes
SHA-256: 7ea6baed1611bba86221932245f0d23efb506451f48a7add551cf0efba3c11ad
font_02_sfnt_off00011f82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F82 10460 bytes
SHA-256: 4fce20c8efd23e4f9216dc10cf3c6bb396a696d6670be277db5d0018965da90d

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