Malicious PDF — malware analysis report

Static analysis result for SHA-256 c67c7dd5da07016e…

MALICIOUS

PDF

70.0 KB Created: 2021-09-26 16:01:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cbfb50b9a4ed149a3b8b8ff019639c1f SHA-1: e888aec8b438544fdf2a0ea894a188afb5c2fc63 SHA-256: c67c7dd5da07016e73424a4c81a3c7cca3d932f99489da6295f03b4454c730a7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://xn--atpta-nfb.lv/images/userfiles/files/zesuturoratupa.pdf In PDF document text
    • https://szallas-karpatalja.com/upload/remekoxutetof.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/161504cba114a8---85804358474.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/pupaxejap.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/bavafobedafakefumojujuru.pdfIn PDF document text
    • https://renewone.de/files/mizinonebuwutej.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/bafozivazalutuwuxofad.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210910_D863A60F59B56031.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/gagow.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-9/20210909081534922786.pdfIn PDF document text
    • http://mrybalko.ru/files/nidirugutadirum.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/36852597146.pdfIn PDF document text
    • https://namphuctourist.com/userfiles/file/31203147104.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/58117571069.pdfIn PDF document text
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/wupelonezagiderivatir.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/56764128404.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/jumememasiz.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/17138403335.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/divuvatitujima.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/xaxepogidejigirixitamaza.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/tumopesemoseb.pdfIn PDF document text
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/40567104639.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/15206191482.pdfIn PDF document text
    • https://media-get.com/userfiles/files/visikone.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=why+is+my+wifi+so+slow+on+my+android+phonePDF 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_off0000af8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF8B 16332 bytes
SHA-256: ebca5db55794f963bb1cb7e595bfe87c47b4baf76d6786547e339b028d0c2d89
font_01_sfnt_off0000d956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD956 10860 bytes
SHA-256: 3b82ff1717228aadcebd2609e9f2dcda9052c3b4804b74e154b91d02537e0a1e
font_02_sfnt_off0000f23e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1