Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bb736c3a03c13d7…

MALICIOUS

PDF

86.7 KB Created: 2021-09-20 23:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 383331f8a07d64dfa0ce04fea452eb12 SHA-1: 4403636e2489e3f78500296f7265071c64b5bc98 SHA-256: 9bb736c3a03c13d7f11941c58a3d07a2f66c875cb5f25eac342aba0caadb23b6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and the link farm heuristic indicate a likely phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://huntic.ru/uplcv?utm_term=how+to+import+contacts+in+android+phone+from+vcf+file PDF link annotation
    • http://adveotec.com/img/file/nulogevimodeso.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/setagifixemiroko.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/27953373772.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/fenebafejulepugikurat.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/66295691539.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1f908c1b5---34376872373.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/denoramibumasilekedosek.pdfIn PDF document text
    • https://gkatsov.com/userfiles/file/84116547083.pdfIn PDF document text
    • http://honghuibio.com/d/files/nelijanusigipon.pdfIn PDF document text
    • http://beganijewellers.com/ckeditor/ckfinder/userfiles/files/wekivev.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/95711446780.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16148b50162555---latovemomapugetusizulov.pdfIn PDF document text
    • http://mlead.net/images/e/file/7192347239.pdfIn PDF document text
    • http://www.rsvpcatering-ar.com/files/imagesfile/jexenarurotesin.pdfIn PDF document text
    • http://hortherbpublisher.com/files/upfiles/file/34662142998.pdfIn PDF document text
    • https://advik.net/userfiles/file/topelulaguteduwikaxogolib.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/09/08/file/20210908_000823_108.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/71442975442.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/wojuditeje.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/wuwugarazuxiviwez.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/rojopalebag.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/29081891177.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210913_B503B74536BA7175.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/sadepiwiduzebi.pdfIn PDF document text
    • https://mraos.com/web/userfiles/file/5367095199.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_off0000ea8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8C 18748 bytes
SHA-256: 3eb003295711b0fd84310b0ca82bf14ba9b079147adbf0dbb46cfba13c9f2382
font_01_sfnt_off00011af6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF6 11028 bytes
SHA-256: 608c7c26b43feaa1e9778f117259e58c17530099630335cf6c23396614fef0dc
font_02_sfnt_off00013473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13473 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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