Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2b94ddf064e3639…

MALICIOUS

PDF

81.2 KB Created: 2021-09-09 22:14:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: efe9bcb3a39ace04d8e3494103bf33bb SHA-1: 684da951c6ae9937c284b4af697a9f3aef3c3551 SHA-256: c2b94ddf064e363945d669ca151ec2d00d7f179e69a48abbdefa40bafa586f8c
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a 'Password-protected archive handoff' heuristic suggests the document is designed to trick users into downloading an encrypted payload, likely to bypass security filters. While no scripts were extracted, the PDF structure and numerous embedded URLs point towards a phishing or credential harvesting attempt, potentially using a link farm to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://spadhotel.com/basefile/spadhotelcom/files/80751713766.pdf In PDF document text
    • https://bouveau-consulting.com/userfiles/file/13950228778.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/16495635863.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135bfc624b2d---25971501899.pdfIn PDF document text
    • http://rts-3.ru/upload/files/dasojus.pdfIn PDF document text
    • http://naoshima-habitant.com/images/blog/file/29707534905.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/917241049.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/zagijekemum.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/73230381334.pdfIn PDF document text
    • https://vilus.cz/userfiles/file/98449356196.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/tegijosazakudokekuniduje.pdfIn PDF document text
    • http://free-note.kr/files/fckeditor/file/2905810686136d7086e7c4.pdfIn PDF document text
    • http://kmsenior.org/file/files/56522744037.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/31213198570.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/23092428022.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/57269188415.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/bemanagegebom.pdfIn PDF document text
    • http://nordicwalkingturak.hu/_user/file/21576550852.pdfIn PDF document text
    • https://basealimentare.it/webroot/files/fck_uploads/File/sabupumovuru.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/17305908390.pdfIn PDF document text
    • http://liderzy.natura2000.pl/imgturysta/files/81757589122.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/31244493606.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/sinukifa.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/34781197525.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=locked+out+of+phone+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_off0000d89e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89E 17956 bytes
SHA-256: 76acbca489484631a28efb18070a7cc045e485d51bc08ca6c2baeba542a74960
font_01_sfnt_off00010736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10736 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4D 10652 bytes
SHA-256: ac107b295f78a688b443a2db6059d3f35bf1e5cc385594bea6ff04c0949dbad2