Malicious PDF — malware analysis report

Static analysis result for SHA-256 f17e5c9215f8c140…

MALICIOUS

PDF

75.0 KB Created: 2021-09-11 19:57:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e1fe01fa50934ecb9a7f8cea99a4c34c SHA-1: 4e284b7a08ebbbf787abc646910d5bd3200825ef SHA-256: f17e5c9215f8c140b65faea36a367b2def734c2e7afe631996c5b321d4e315f2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to potentially malicious domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://signatureshreyas.in/userfiles/file/8245677116.pdf In PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/semewuranaxurekibekilu.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/80153991510.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/9af4879d8c0a130e0f1d9d762355c524/dipudadot.pdfIn PDF document text
    • http://ztracenaexistence.cz/files/content/file/dajinokalukegoruraki.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/60111873374.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/75103520656.pdfIn PDF document text
    • http://i-tos.com/userData/board/file/kapuwadugaxusogamixug.pdfIn PDF document text
    • https://foodthings.us/userfiles/file/xinuferaxejijafobixe.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a43e63e1d8---kedejusunamitel.pdfIn PDF document text
    • https://keyword-lda.pt/site/upload/file/zizirerif.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/vagajatamoxofobijuj.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021091115342778496.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/wejipexogokefav.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/pejolu.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/nabexepolo.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/gefipovokaxi.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/91879936500.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/palurezelovaxutasoxupej.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/19986485783.pdfIn PDF document text
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/nevolifiluxokatoduwomanof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=highest+frequency+of+electromagnetic+radiationPDF link annotation
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/pixesomovemudikupis.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_off0000be71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD688 11272 bytes
SHA-256: 6702dc3dc8d32654be93488233fa2167b64bf1aa11f0c88e3f5625764a9dfdbd
font_02_sfnt_off0000f044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF044 17592 bytes
SHA-256: d33d7bbd87c161259b40c76885cca819417250f027e62f2be5d909302563a75e

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