Malicious PDF — malware analysis report

Static analysis result for SHA-256 58451ce93eccb228…

MALICIOUS

PDF

75.0 KB Created: 2021-10-11 17:50:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c4c2ccc8e28712891b3996e5e8d1709c SHA-1: 671bbb2aca0dd994f790ee4fc104f21bbb08fd22 SHA-256: 58451ce93eccb228c219757b36ad3df878f320b8316f49cf516d037cf30eead1
166 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'SE_SECURITY_BYPASS' suggests the document instructs the user to disable antivirus software, a common tactic to evade detection. While no scripts were directly extracted, the PDF structure and numerous embedded URLs, including one identified as a link farm, point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://wijnhuis-vaessen.nl/site/data/ws/files/76880153182.pdf In PDF document text
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/juboxikabisimuvatakipoma.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32661632423.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/88023644915.pdfIn PDF document text
    • http://hqshop24.com/userfiles/file/binitijotejukikaratulavi.pdfIn PDF document text
    • http://ubytovna-krumlov.cz/userfiles/file/sekusuboduvesaniwu.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/lawojudiduxegirax.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/48829598246.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615b5f2c18b81---41971839976.pdfIn PDF document text
    • https://www.netcorp.hu/data/editorfile/66473375571.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/44206306202.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/kimezoxoludifilitixivetu.pdfIn PDF document text
    • http://www.optimizecost.com/admin/ficheros_fckedit_subidos/tufojuba.pdfIn PDF document text
    • http://3m18.com/images/editor/files/6811584077.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/46607751713.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109111536367894.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/71046397582.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16161959d1a030---84052062503.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/sivigebu.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/53635142231.pdfIn PDF document text
    • https://xn--80ag1a2a.xn--p1ai/files/file/34267799156.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/dipiwitiwugogumokira.pdfIn PDF document text
    • http://gonganmi.com/userfiles/file/pusuf.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/1hHberoKktI/uplcv?utm_term=minecraft+pc+free+download+java+editionPDF 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_off0000be31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE31 10720 bytes
SHA-256: 686a061df2ab57e7864be6cf6f1024e495fecefea0343a7b4f0ef9e9e855ab1b
font_01_sfnt_off0000d6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EC 18152 bytes
SHA-256: 435ec2ab3648565dbeef12883efa4781bdc06e414040012fd2816c3c8a6a60c4
font_02_sfnt_off0001064d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1