Malicious PDF — malware analysis report

Static analysis result for SHA-256 a091a716dc205b72…

MALICIOUS

PDF

84.6 KB Created: 2021-09-14 15:16:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 633e5be9604f85186a239f4089229535 SHA-1: 99c4ae5c7a3d1f6cd3695e58a431cc31dc078515 SHA-256: a091a716dc205b7279bf72da8a49fe9621ad245d45b316603f3b941558118a17
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to redirect users to multiple distinct hosts. No scripts were extracted, but the overall structure and URL presence point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://huntic.ru/uplcv?utm_term=best+kingdom+war+games PDF link annotation
    • https://eclearusa.com/images/file/kojotekogudojowup.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/48758162226.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/funasavogateramowof.pdfIn PDF document text
    • https://soenen-pneus.com/upload/file/zozalufagufajupuzigupi.pdfIn PDF document text
    • http://beta-rc.com/upload/files/54809007649.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/815248659613f4cb623225.pdfIn PDF document text
    • https://dpengineerindia.com/admin/userfiles/file/gojolefewemuboganetuzezob.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/bageroduruninajenumiritep.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/45105178524.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/begel.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/75459010172.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/94545938511.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/duvexinoz.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/fuzunopepawu.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98196650598.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/77205671079.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/soliko.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16132f3d57fb16---99769998371.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/dusiferemijip.pdfIn PDF document text
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/59232509529.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/40970831445.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/93404371838.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/gugokokiwusuladomininosoj.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/46453417241.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_off0000e525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE525 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3C 10776 bytes
SHA-256: 2e664c3e03ac7469b0ab1f411a487c6141548cf3000f21558588c3a2215831a1
font_02_sfnt_off000115f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F0 18000 bytes
SHA-256: 0a320aacc0e9bac74e90f22da8c5c8fcc74478ed1013a88aec414e9f7ee9e8ff