Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcbef8dccd94dd32…

MALICIOUS

PDF

68.4 KB Created: 2021-09-24 20:23:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 45248744af4c11d67426ed1998e2f6aa SHA-1: 9d60cb32b6a68a5156f2839d776919d53118ecc8 SHA-256: fcbef8dccd94dd32487405b0b1f84ff3681b03be9fbdf15f1715c62907b59e20
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://menifee.hanasushichoice.com/uploads/files/tefuselixi.pdf In PDF document text
    • http://www.f2dassociates.com/userfiles/file/bukusumoso.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/wawilobod.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/56343298305.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/69466065424.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/mizuwolepesivu.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/62844498481.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/raruv.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/xonobuduxarigapigovojovig.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/kutupasesisekup.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/53813488050.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/161423b74968b1---80999607497.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210911043759.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles/file/50316901913.pdfIn PDF document text
    • https://khanikango.in/file/41134452671.pdfIn PDF document text
    • http://manegedebuitenwijck.nl/uploads/file/gapabosuvelalapusez.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/34981880212.pdfIn PDF document text
    • http://pk-rowery.pl/user_pict/file/6714947528.pdfIn PDF document text
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/vizavobuke.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/tifatejamuvupajudulajof.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/92793921770.pdfIn PDF document text
    • https://ymy-tea.tw/upload/files/59270635998.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/aad248547dc9706faf58d7c3dbec6d4f/gifokesizopo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=unblocked+games+fnaf+4PDF 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_off0000aeda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEDA 14732 bytes
SHA-256: d6e64cadaba6f774ce308d6824e7e09924a0817d531981cef28e6f84f1f8007b
font_01_sfnt_off0000d37e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB95 10844 bytes
SHA-256: e75fa4b4ff3e5732cd59073bcd773649b13865c8639722ea233d30b1983d880c