Malicious PDF — malware analysis report

Static analysis result for SHA-256 863f31f16ab13f7a…

MALICIOUS

PDF

87.0 KB Created: 2021-09-16 22:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9184728f37e90eb8cc66f5103a10f1e7 SHA-1: ca8434d16d1de66df975c2742bd91e1ba0881d84 SHA-256: 863f31f16ab13f7a43e20b91fa0cc834da7ecc7a22a916912bc852f2a5a05039
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. The heuristics identified it as a link farm with multiple disposable URLs, suggesting an attempt to redirect users to malicious content. Although no scripts were explicitly extracted, the nature of the PDF and its embedded URLs point towards a common phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/jupufiwerajugofobozoge.pdf In PDF document text
    • http://maxbrio.kr/files/files/nolonoma.pdfIn PDF document text
    • https://triosms.com/userfiles/file/zikiz.pdfIn PDF document text
    • http://www.farmaciabergua.com/userfiles/files/wopevexutofegajisotur.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021090614512898.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/11080399075.pdfIn PDF document text
    • https://kohphanganhotelandtour.com/userfiles/file/34120098148.pdfIn PDF document text
    • http://mcutech.net/files/51062460129.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/45a220ecbf9c0ea68ffd845069a53411/98475958997.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/jezitisutevezipofip.pdfIn PDF document text
    • https://klcconsulting.eu/klc/file/83814033707.pdfIn PDF document text
    • http://engcaphone.com/_UploadFile/Images/file/17073549250.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/femenepofugilokuxatit.pdfIn PDF document text
    • https://porfic.com/fotos/file/46237796495.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/rigorixupivunuda.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/87029710689.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/paboxopijazuwazizib.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/nifidajezinekerolovisivet.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/wodijemari.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/52054024954.pdfIn PDF document text
    • https://123natura.com/stockages/files/33792672557.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/72290243515.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/ketosoxebimef.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/bojogi.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202109030203024779.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=utorrent+apk+download+androidPDF 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_off0000e94e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10165 10400 bytes
SHA-256: 4590ba9f4ec5d94a043f9e84d0cb496cb1bf1ab5cecf41d2d17e86dd1aa43148
font_02_sfnt_off00011906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11906 20832 bytes
SHA-256: d8568dd0bab7ece40ef6b80afb5b07dacf357d778e0eb30db143f2b4c7306a7d

Open this report in the interactive analyzer, or submit your own file for analysis.