Malicious PDF — malware analysis report

Static analysis result for SHA-256 c95009402333c7a3…

MALICIOUS

PDF

80.2 KB Created: 2021-10-05 14:17:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 0b053d36e8e2c42d7ccff62ae0cafdb0 SHA-1: 82e75193114d9b06e3d1031df788dcf6382390cf SHA-256: c95009402333c7a31ff17639f1a5ec756aefd2f74a752ac98d9c32c7fbe14932
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to disposable domains, many of which are structured as link farms with UTM parameters, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • 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 https://catamma.ru/uplcv?utm_term=accountlab+video+to+mp3+converter PDF link annotation
    • http://nhadephoanhao.vn/upload/ckupload/files/wazigu.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16143a5a4cbd0e---bafalisutizoxibor.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/futofagafa.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613da5726ec5c---16337667314.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/77447824312.pdfIn PDF document text
    • http://bjqyms.com/filespath/files/20210902113244.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/zipoko.pdfIn PDF document text
    • http://podarox.ru/public/files/sofumuzekerazubedopetu.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/84974611376.pdfIn PDF document text
    • https://kaptenhoki.info/contents/files/43666214725.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/pukago.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/katitilatilu.pdfIn PDF document text
    • http://leeandrewdavison.com/download/jamijovibabedalo.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/ginefuv.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/89521694921.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/nirexesubajumasudewop.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/rizalozetujebo.pdfIn PDF document text
    • https://wittnebel.dk/file/duxereregopog.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/12777913302.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/96783900944.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/gawurazitunikabojosak.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/81589730755.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/52691054064.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/1e7a0ffefa144d621cc2e45d093b385b/tofim.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_off0000d68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68F 16768 bytes
SHA-256: 977488c6c7a192de756712c2bea7f77b955d20db99db2708963fee287343bcac
font_01_sfnt_off000101c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DE 10964 bytes
SHA-256: 2dd980e2dbee0beb91a9e59e40062c083a36034dffe22cdb54309d7a9f9cc0df