Malicious PDF — malware analysis report

Static analysis result for SHA-256 610b692e357464bd…

MALICIOUS

PDF

82.2 KB Created: 2021-09-18 14:35:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 30c6eb0abf2e542c10abc587d11bb64e SHA-1: f7b0ac08047d390e044fe33743a40eea74cc419a SHA-256: 610b692e357464bd21a254ed312aee03397b8e0e627d692e68203aa00fdf2d93
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chcial.ru/uplcv?utm_term=how+to+uninstall+news+home+app PDF link annotation
    • http://marketingnews.fr/images/file/xenowuzaruwaroromewo.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/15496910520.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109071454373958.pdfIn PDF document text
    • http://onelove.cz/file/53203221046.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/39009645227.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/rufulajusaxudemovodinubeb.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/13670958788.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210912190827.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/44774861469.pdfIn PDF document text
    • https://malinaionescu.ro/userfiles/file/zonakigafezi.pdfIn PDF document text
    • http://swotaweb.com/img/upload/file/xugejosapokudovetovelozow.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/kuboduxobowonusaru.pdfIn PDF document text
    • https://paramourpourbebe.bettygagne.ca/userfiles/file/gaxotinutet.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/36936788680.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/88656093990.pdfIn PDF document text
    • https://cliniquemyo.com/userfiles/file/pixulupubotowisadebu.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/zakikipumozot.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/77572115759.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138abec1aed9---mujodebisekekaxaxib.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/bevadokemofezitupejogir.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64066365283.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/99192355138.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/tunewapanunijimu.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/613e4abc91811c86d14c9e062f4c053f/givuxob.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_off0000de12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE12 10596 bytes
SHA-256: 3a0c780bdc7d7237dbdb16cca49dadc2e0b0498634ef9a872ed41fd2f90c0415
font_01_sfnt_off0000f619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF619 17296 bytes
SHA-256: b995691bfb82ec00dfa6f238733ed4b01f46b8747d01f12104c3d4d56e42506f
font_02_sfnt_off000122e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1