Malicious PDF — malware analysis report

Static analysis result for SHA-256 6286be0f114e1a2e…

MALICIOUS

PDF

81.3 KB Created: 2021-09-16 22:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 01de522c0633013467a42838fd0cb218 SHA-1: 20ca611308466a3d3d42f7d84f8df5d9edcbd823 SHA-256: 6286be0f114e1a2e7992b724f4bf10c2c01f784c201412116ab1ff8012b17cd4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm on disposable hosting, containing numerous links to PDF files on distinct domains. The document body was unreadable due to encoding issues, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://juraganmonyet.com/contents/files/23302023807.pdf In PDF document text
    • http://wanyuantemple.tw/userfiles/file/99245138530.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/pebirogiwidu.pdfIn PDF document text
    • http://reafamily.lt/ckfinder/userfiles/files/40458648229.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/mofavonatoju.pdfIn PDF document text
    • http://idealthailand.com/file_media/file_image/file/1566382740.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vazaxepavobe.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/88037123197.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140cef5b16e9---lavawagekewapoxibotaj.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/varavikebakoxoxutiwit.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/54881756819.pdfIn PDF document text
    • https://zzhqhi.com/d/files/varujiseriku.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/99217619378.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/zukumus.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/xajirikalukawukivu.pdfIn PDF document text
    • https://galaxy-training.com/userfiles/file/465947834.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/47056387938.pdfIn PDF document text
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/bivijisogotobiwapigu.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/22902129624.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/76498440044.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/29308279299.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/pagugor.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/wasivusujejumeliti.pdfIn PDF document text
    • http://cf2sc.cn/userfiles/file/satarozepu.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614385667e215---rabududimu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=android+app+specific+notification+soundsPDF 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_off0000d6a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eeb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB3 18324 bytes
SHA-256: 02c5b45040d6e40f155ba19e76818b360024b77a6c36e273f6d339aab94d4d41
font_02_sfnt_off00011ef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF4 10648 bytes
SHA-256: fa0d1b9e516fd01a619f7fff0f58d1b87d6b6e0bba184688cbc9634393e6300d