Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cca6bb0cdc2d3da…

MALICIOUS

PDF

70.5 KB Created: 2021-09-24 15:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 19294825a0d73e2cd9e8554ef2fe118a SHA-1: 218c1711aba89114025d141273671902f9f2a9a7 SHA-256: 9cca6bb0cdc2d3da1816c6ed9720b9dbf90975594b68884536251b260d95e357
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many of which are hosted on disposable domains and utilize UTM parameters, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the PDF structure and extensive URL usage suggest an attempt to lead users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 4

  • 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://irlanc.ru/uplcv?utm_term=sd+maid+pro+key+apk PDF link annotation
    • http://honeystraw.com/uploadfiles/file/datekakavox.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/61133809525.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/vununatut.pdfIn PDF document text
    • http://ppogrimall.com/upload/editor_image/file/lenurupob.pdfIn PDF document text
    • https://lederstuhl-shop.de/ckfinder/userfiles/files/jenaneravibaro.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/kewudutosezopegexuvuwix.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/sikujod.pdfIn PDF document text
    • http://chipmax.in/chipmax/ckfinder/userfiles/files/60751930874.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/60215631736.pdfIn PDF document text
    • http://cascad-trans.ru/files/23802491734.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/74977683248.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/98773271531.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/sififuvefepozubar.pdfIn PDF document text
    • http://solee.cn/ckfinder/userfiles/files/matopana.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b199b05b01---zobumujikamoku.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/51a1d9dd3c7a48e6a688c84b73870b74/zuvimugidotadaxenawiremiv.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/zonafewu.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/mininer.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210831_184948.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/bapewisetivepusijanabore.pdfIn PDF document text
    • https://majubesar.org/contents/files/11482969515.pdfIn PDF document text
    • https://it-remarketing.pl/app/webroot/media/files/magunakipi.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_off0000b186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB186 16900 bytes
SHA-256: d3d68a193b411cefc910a896b9a4071534fca282af2cdef26fb68e1dc200e89f
font_01_sfnt_off0000dc89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC89 10416 bytes
SHA-256: a0614b56ad0effe21318737c48cd9ee38b5283b9d05739bdf0958c337902ae35
font_02_sfnt_off0000f425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF425 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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