Malicious PDF — malware analysis report

Static analysis result for SHA-256 bca3f606601298a8…

MALICIOUS

PDF

80.3 KB Created: 2021-10-15 01:58:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2523aa1241fa33a4ecbae551f2dade0b SHA-1: c7ea09ceb3884226c111d4b246ba3153f7d3c722 SHA-256: bca3f606601298a86bdd8eff714224027b7e964f4c4d95634cdd274887ff6b40
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document's structure as a link farm on disposable hosting, reinforcing the malicious intent. No scripts were extracted, but the presence of many external links suggests the document's primary purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://justforjetscatering.com/userfiles/image/files/xodidevamabix.pdf In PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/60730923476.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/16759981058.pdfIn PDF document text
    • http://steffis-strassladen.de/userfiles/file/joletoreludejifatasasub.pdfIn PDF document text
    • https://sakesushimn.com/userfiles/files/muvep.pdfIn PDF document text
    • https://renetravel.ro/images/files/57760389575.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/pozuzemulizubot.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/nojegubenigupi.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/dafigogukolupip.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161314b294c480---gufebokilawemigupatufono.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/13816058500.pdfIn PDF document text
    • http://purepoem.com/resource/docContentImg/file/2021-09-02/036beec35a8141153e6e88e0a020b6a4.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/begeweluwutosigafolo.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613377e8732ca---88476755040.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/fizezapivabuw.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/10330061677.pdfIn PDF document text
    • http://goldmustang.ru/files/files/tamepe.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/diduma.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/kofenobagazaz.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/dinolavawezofamutupidu.pdfIn PDF document text
    • http://daliangluyinpeng.com/userfiles/file/54213506702.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/18433888494.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/74886560653.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/23D8k0Ec_6w/uplcv?utm_term=i+like+to+drink+in+spanishPDF 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_off0000d8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E0 16680 bytes
SHA-256: 1c1e108d761fd3074a03a5d2d8554aad6844749833e13363e538883db908fb4e
font_01_sfnt_off0001041e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041E 10532 bytes
SHA-256: f8d444a78803731b6b12c22d9a2189ccf56daf582e406394367c4a96b6e868d0
font_02_sfnt_off00011bff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1