Malicious PDF — malware analysis report

Static analysis result for SHA-256 c78bffe6703fa6e0…

MALICIOUS

PDF

68.8 KB Created: 2021-09-26 16:36:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c43d09a69acd5b65352aaaf020067a93 SHA-1: 2a52344c56813ef1caaaf4135d4e2ca512f66f7d SHA-256: c78bffe6703fa6e0426e566b7cdc844530e2a97997f2368395f4b746adcd2426
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to disposable domains and utilize UTM parameters, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://coretry.ru/uplcv?utm_term=download+anime+free+android PDF link annotation
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/tuzejoxenogas.pdfIn PDF document text
    • http://cascad-trans.ru/files/lixuneramezotazi.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/suxapavigarevomavej.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/nipuvotorewokufozes.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/52868715672.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/65605301766.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/98360570567.pdfIn PDF document text
    • https://austarpharma.com/upload/files/momotibixofatono.pdfIn PDF document text
    • http://giorgimpianti.com/userfiles/file/80266563127.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/90568768940.pdfIn PDF document text
    • https://waxparadise.pl/userfiles/file/58373065656.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/74368949942.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/wemagilolenukalerukod.pdfIn PDF document text
    • http://dallard.fr/ressource/site-image/files/53505647479.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/wekama.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27361583548.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/161494f73173fa---tuzowen.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/66143607d35c32d122e35040fa1b2c8e/49553237646.pdfIn PDF document text
    • https://casaalu.com/luutru/files/40706644797.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/4556515238.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/1781434075.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/xalekigirudatabugin.pdfIn PDF document text
    • http://rubensova16.cz/files/file/68263774635.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_off0000b14f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB14F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC961 14640 bytes
SHA-256: 60bff3523da724829caab8380ab13b886de58512cce7688805f3dddb1d5fc744
font_02_sfnt_off0000ee55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE55 10336 bytes
SHA-256: 48c73d0e1185b63eeb8fee97e92636969f6b22fab9c3b23e9310692450ffb3bf