Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fd32683cc4bb158…

MALICIOUS

PDF

111.4 KB Created: 2021-09-17 07:44:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 83c3cd8efce36b149e0bbeb9515a527b SHA-1: c396753fe81c19412e90671efb825c7984fdbf42 SHA-256: 7fd32683cc4bb158b925baaea1151dd16f8e355474a6be74db40817e711bd37f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains or are structured as link farms, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://floridainvestment.cz/files/file/294523737.pdf In PDF document text
    • http://murzilka.biz/images/uploads/file/wisofodojiber.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/75709812050.pdfIn PDF document text
    • http://gucaoyun.com/uploads/file/062134258799.pdfIn PDF document text
    • http://www.dgtrans.co.th/login/ckfinder/userfiles/files/54056718874.pdfIn PDF document text
    • http://henca.com/files/details/file/ladodofifuxopiluki.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/xasadalutol.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/wusijorag.pdfIn PDF document text
    • https://datajournonepal.org/files/4500456797.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/58107197127.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/temalilik.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/tekofazovon.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/pigir.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/56014144554.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/rubojujopewuginidag.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/poralufikuzekuzejikus.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/71003425065.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/75333754807.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/974264567.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/26898222965.pdfIn PDF document text
    • https://laundrybyconrads.com/nbloom/fckuploads/file/71551120195.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/jogisadekivifidexejewobiw.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/vatuxu.pdfIn PDF document text
    • http://01host.ru/userfiles/files/xeled.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=ultraman+taiga+new+generation+climax+full+movie+eng+subPDF 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_off00013fa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FA5 23824 bytes
SHA-256: 2c6d0de6e479903003586fd90455a42ad96134165a3cef2e5f36f1d798eb0aae
font_01_sfnt_off00017cd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000194ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x194EE 11180 bytes
SHA-256: 4659f9e873902a29aab8f252c3e54f02277e73755c475f1668cf0704ae66895c