Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aa33cebcc47d05d…

MALICIOUS

PDF

85.2 KB Created: 2021-09-21 17:16:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dbb1bfd343231240a4b24e6bdcec589a SHA-1: 15dba7431dc091541abfe35ab6936848b2a8bf0b SHA-256: 7aa33cebcc47d05db7a6a70e7744c9f5f36858898759d51a3277aeb9c6192d85
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it's part of a link farm designed to host multiple links, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or credential harvesting attack, possibly using JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://vetamblj.si/ckfinder/userfiles/files/rodenazexebubelegotarumo.pdf In PDF document text
    • http://tnslib.tools/userfiles/files/46221505964.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/sajolixezobexafede.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f1bf9e2fe---40910700382.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/39785256246.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210902014642.pdfIn PDF document text
    • https://hklh.vip/data/attachment/file/1023909601.pdfIn PDF document text
    • https://belretail.by/ckfinder/userfiles/files/70751303067.pdfIn PDF document text
    • http://kbo.pl/ckfinder/userfiles/files/22844301778.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/wivaxigopepetifejavadog.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/25106260333.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/vomafibusat.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/4689419165.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/kosar.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/saresowalu.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/61354358298.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/69540622020.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210906063732.pdfIn PDF document text
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/vofofovewagag.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/jobumegem.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/j3g65u2gmr7tf7s3nhmfhs3q3s/majudarenitupof.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/navebokipozige.pdfIn PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/baligutopewuwodadavik.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/fefapurujenuxarug.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/14803157676.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/tafewuloguwigobumusujivep.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/jewezutitepo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=windows+10+free+download+for+laptop+64+bit+full+versionPDF 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_off0000e37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB91 18668 bytes
SHA-256: 6589ed923edbff5ecef744f57c82997b41eb9aee3a89be8edae497e68bb5ca3c
font_02_sfnt_off00012c26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C26 11296 bytes
SHA-256: 9712ea5f7e9b45ae9827deeb0dfc6ae3a61bad5dffd11e0eef9aee41650f7306