Malicious PDF — malware analysis report

Static analysis result for SHA-256 796c33984e499fe9…

MALICIOUS

PDF

83.2 KB Created: 2021-09-12 20:09:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 82ecbdb3fc68d7536a9237936b67cf8d SHA-1: 8b1c1c133bdd9c807fc6d9c0cbc7c1a7e92b3595 SHA-256: 796c33984e499fe91e7988735195ba99e5802749e26c80aca39f1f1e72752391
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://catamma.ru/uplcv?utm_term=best+beep+test+app+android PDF link annotation
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/52944810104.pdfIn PDF document text
    • https://pixel.bg/img/file/finusakazazogibid.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/nufur.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/33342069000.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210908140852517.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/46244077775.pdfIn PDF document text
    • http://solartgaleria.hu/images/file/bidiwi.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/81858374598.pdfIn PDF document text
    • http://wernitznigg.at/files/13144161571.pdfIn PDF document text
    • http://cwpni.com/userData/ebizro_board/file/dezakasuwadinabeg.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/88052930826.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210904/file/16307073566720.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/fedidix.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/62693237630.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/rawokujow.pdfIn PDF document text
    • http://aminotp.com/upload/files/98001025714.pdfIn PDF document text
    • http://jcpingie.be/public/files/gexukutugigo.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/29494192343.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/nojowexinowenixujotote.pdfPDF link annotation
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/20290382944.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161386062c7d21---70166606246.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/94846607243.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16139d12cf3750---bemulasanuk.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/65780317790.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210912_20D81631D6825A48.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_off0000e131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE131 10532 bytes
SHA-256: 447f70da41a44cfcaae5520f3702c42a1f4d7d3901033f8e0d0a4e2833edeb9a
font_01_sfnt_off0000f918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF918 17664 bytes
SHA-256: 27f261cd3689366fc308b8624e724b8e4b50bf79248fed4bbf819be68b5cad21
font_02_sfnt_off000126eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1