Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3274a90229c02d1…

MALICIOUS

PDF

78.8 KB Created: 2021-09-16 04:33:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: fb88b729537bb8c8840037b88397c63a SHA-1: 213c9059b64d7188a41437ec3cf8b044a151d2db SHA-256: a3274a90229c02d1b11afdaf731e68d6b9204ae44893430916a6967726e5fdfb
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable or unknown domains, indicating a link farm designed to redirect users. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM confirms this behavior, suggesting the document's primary purpose is to distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://kawanmto.info/contents/files/datepif.pdf In PDF document text
    • http://jamalcar.com/userfiles/file/32422890825.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/41161301491.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb6495dd04---52348152105.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/woded.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/79876227477.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302c6cd3ec2---salolozogisekexi.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/kupazadotevofekufiwotiw.pdfIn PDF document text
    • http://keyday.ru/files/files/92364234334.pdfIn PDF document text
    • https://stormester.no/files/file/61131325880.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/marasuwokibinopejavipix.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/82818049684.pdfIn PDF document text
    • https://lanjutpt1.com/contents/files/41976023954.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/ximerezusapeni.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/99843075129.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/16673949017.pdfIn PDF document text
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/nibonibogigudefuderabakib.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/lodezemuxebife.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/84517111709.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/96081681376.pdfIn PDF document text
    • https://rinducm1.com/contents/files/88289737643.pdfIn PDF document text
    • http://fsanaq.com/upload/file/2109110204312422523b3tr3nozda6.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=fluid+flow+a+first+course+in+fluid+mechanicsPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B8 10904 bytes
SHA-256: c1c350fc1b16fdf02db7619707d659f6ede5a9ddbe5faa4ffccf15b9cb663de8
font_02_sfnt_off000100cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CB 17132 bytes
SHA-256: ee27d232452bedba7aad48338543e1510c1d03ad7b9e08ddd40caed3dc70a4be

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