Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e34bfe71b2a6a59…

MALICIOUS

PDF

81.6 KB Created: 2021-09-19 23:22:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c34fc4882e983ac72aa502ebee285d37 SHA-1: b4bfc0e7bf8d591c5f298ff4dc54a8afa46b81a0 SHA-256: 8e34bfe71b2a6a596f287e9b8efcf55b2dfdb1b05d624fc22ef0fd5910ff2194
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of embedded URIs, many of which point to disposable hosting and utilize UTM parameters, suggesting a link farm designed to redirect users to potentially malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URIs strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://irlanc.ru/uplcv?utm_term=games+like+disney+arena PDF link annotation
    • http://bursaceyizgelinlik.com/images_upload/files/nikigumov.pdfIn PDF document text
    • https://primer-spb.ru/files/files/xilidovutulofedinumil.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/tadekefajoriretumu.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/80937697974.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/16783128522.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109070324205163.pdfIn PDF document text
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/63430998119.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/sanirezutukumi.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/ribufatajafopipijadebuwe.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/40664872975.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/82538989480.pdfIn PDF document text
    • http://flamefitnessstudio.com/cewit/images/file/pazadufeligivalisir.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/32881996923.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/66878623299.pdfIn PDF document text
    • https://rtaadmin.mrv-educationservices.com/content_file/files/16164310038.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/48893374120.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents/files/sebijipufof.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/rawasutozuj.pdfIn PDF document text
    • https://best-label.com/upload/files/taroxesuzipufivaxetegafo.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/vakovezubawujugus.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613584dea465c---79072536818.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/20049193523.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_off0000d831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD831 10436 bytes
SHA-256: bf341a146e0acfec6a377ad7db6184d23fe300aa46bf097e0d23eb24678b7ab6
font_01_sfnt_off0000efcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DE 18860 bytes
SHA-256: abe5cefebfd9d99a0f38117f149be0a64054d7e4bb55814ccf8283be83dc0412

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