Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7da84df05e393cd…

MALICIOUS

PDF

84.5 KB Created: 2021-09-19 15:28:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2219f1f0652a7e394a0e421ea6feb41f SHA-1: a500ef1f2cb54f4f890f9f151282934554a77d8d SHA-256: a7da84df05e393cd469aaabb388d55ac889fd5d6f509ced4dd798442586c45c2
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document is designed to trick users into installing a fake browser extension or update, a common social engineering tactic. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme, likely involving a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 http://jedzenie365.pl/ckfinder/userfiles/files/79420964695.pdf In PDF document text
    • https://gancza-yacht.pl/userfiles/file/fafekajisupowizuf.pdfIn PDF document text
    • http://twilaw.com/files/files/libelosilufadilen.pdfIn PDF document text
    • https://kapefashion.com/files/files/vugavavufexazareropi.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/29807514860.pdfIn PDF document text
    • https://jv-cms.crazy-jessie.nl/uploads/files/27996977066.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/gerejibubumafesebekalav.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/1406286502.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/80735374137.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210909141529.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/e8fd76c503a27ca02292145477cac4e5/fubusovumed.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/nofarekorubinol.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/pubaduvawejejiket.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/33836421056.pdfIn PDF document text
    • https://fpcofmacon.com/nbloom/fckuploads/file/98111723458.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/bigajegoxuvorudimir.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/getibevalanovuz.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/wazugizadaketidoduxi.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/89348681252.pdfIn PDF document text
    • https://jetaime-shop.dvsportbg.com/files/sifemupevodek.pdfIn PDF document text
    • https://didaktika.drmix.cz/uploads/files/fanemabojosew.pdfIn PDF document text
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/94763179438.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/wuxupexesorimiril.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/1a50c8797578571c058dc1d20a710f74/32213240943.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=where+are+my+screenshots+on+androidPDF link annotation
    • 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_off0000e1c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C1 19136 bytes
SHA-256: 749bfff41ebe8eed07e8f5548c13b619635a81b6f79f5c43c81ecdbc8a85a2e3
font_01_sfnt_off0001135e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135E 10696 bytes
SHA-256: e3e8d29df5f6545c68dfb98ef9c137804c72351636b066f31e4156ddbe441ae4
font_02_sfnt_off00012bd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1