Malicious PDF — malware analysis report

Static analysis result for SHA-256 b58a5cf93e29b114…

MALICIOUS

PDF

72.2 KB Created: 2021-09-11 11:37:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d1d29907cfbb8ecda80f9acf316eb4a6 SHA-1: d78b5adb6c2cdb0456b303376cd4d076267df238 SHA-256: b58a5cf93e29b114d477b1e6fe847821c036b85d494337d73c2d289fe27c36dc
166 Risk Score

Malware Insights

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

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristic 'SE_BROWSER_INSTALL_LURE' suggests the document's content is designed to prompt the user to install a browser update or extension, a common lure for malware delivery. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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
  • 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://candientu24h.vn/webroot/img/files/13904605082.pdf In PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210909_9CED7A9D45DEE3B5.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ginepiruxuke.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135357b63958---zasabapid.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/4876942134.pdfIn PDF document text
    • http://nerezove-kuchyne.cz/UserFiles/File/72956082177.pdfIn PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/kavasikikikakanisaxi.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/88654965086.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/leveturumoju.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/14407678473.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/49112715530.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/tasaweju.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/23021722971.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///82059338125.pdfIn PDF document text
    • http://drironcat.com/images/file/tazagagetujegasotixog.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/12900846278.pdfIn PDF document text
    • http://net-marketing.hu/images/files/doradudexatonuxorasuri.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/39436874170.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/27736254750.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/radepez.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/63852870c75187078a001644c3b887a7/sisusitejifudoxuximiwewe.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/negawuparutagabedalejolid.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/lejupe.pdfIn PDF document text
    • http://mobil-tech.com/files/83686260607.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/jobezale.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/88499964210.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=chromecast+pc+to+android+tvPDF 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_off0000b7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7A3 16544 bytes
SHA-256: f1ef5a820f0b250bdb4a1279d99b8c6a25960e9d85695fd585b043c85924827c
font_01_sfnt_off0000e253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE253 10828 bytes
SHA-256: 91de91037297eabf725be1fa2ee39012c155ad038e071c172f1d202f456612d4
font_02_sfnt_off0000fb33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1