Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5e0441c03488a43…

MALICIOUS

PDF

69.8 KB Created: 2021-09-22 18:58:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ef2d4bb57f683f8f6fd08a24b892afad SHA-1: b26ff4398ee161acfa73c5acb4eb029ee9c3c499 SHA-256: e5e0441c03488a4323f51f425980b353a17d4bf97d865c510fe4bc51c2f166e7
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing or malware distribution scheme. The ML classifier and ClamAV detection further confirm the malicious nature of the file, likely exploiting vulnerabilities to execute code or lead to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=world+top+5+player+in+free+fire PDF link annotation
    • http://allefrgycg.news-read.com/upload/files/binoxiga.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/96320819976.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/47841008226.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/12999887630.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/67205646076.pdfIn PDF document text
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/jamudipon.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/refubusazubetole.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/wakijibusafepubonamot.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/revugajuki.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/purexopekedozerigek.pdfIn PDF document text
    • http://moje-stranky.eu/userfiles/file/simevukinawowonexofogak.pdfIn PDF document text
    • http://it-hair.com/userfiles/nidomes.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/42567907037.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/dibezokovisa.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/24016695953.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ec38d6197---2255389395.pdfIn PDF document text
    • http://miyisz.com/mingyi/images/userfiles/file/pojuvatekotesibebo.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f40e67f7a9---posukodowopizoledurifu.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/vewegigafosuz.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/81160948172.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/jodofivitasigeduwuvi.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_off0000ae2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE2E 17040 bytes
SHA-256: 6643a411b7e08f9ece02210aa41fe5a6e245260369a19cbbc4014ada0bdf29e9
font_01_sfnt_off0000d9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D5 10564 bytes
SHA-256: a073f52d3ccb30ec20f1701526a13255a8f1daa39b62e7d5bf13b3deb5b783ba

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