Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bd410b1a671ab40…

MALICIOUS

PDF

81.1 KB Created: 2021-09-16 01:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3445de3f1c97062e62f5527f6d15df60 SHA-1: b85a6dadf9b4112a7cf63b7a838b91caf5863b25 SHA-256: 3bd410b1a671ab402fc10ae021a8b994575193ababdcd389545cf368d4596ce8
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 high likelihood of malicious intent. The PDF contains numerous links pointing to various domains, many of which are identified as a link farm on disposable hosting. This suggests a phishing or malware distribution scheme where users are directed to potentially malicious content. No scripts were extracted, but the overall structure and URL distribution point towards a common phishing or downloader pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://fsf-vastroad.com/userfiles/file/86506111254.pdf In PDF document text
    • http://abc-tel.ru/data/File/juxilesuponirana.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/zetegebawexajozusafew.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210912/file/bomelevarujura.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/80283713207.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/dulalijalufif.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16142624daf033---85170298130.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/17630333101.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210914_A2A7295DCA3629FD.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/vabidosabazidaleleru.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161426ad5db31c---zatizoxuzejul.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/23584307486.pdfIn PDF document text
    • http://kotolantopeni.cz/file/poxakivibumovofa.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/nunozesugekamodilub.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/92552785775.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/xufufe.pdfIn PDF document text
    • http://cy2hand.com/userfiles/88136598955.pdfIn PDF document text
    • http://geose.ru/userfiles/file/visewudepesisepodinakufo.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/pikenakeko.pdfIn PDF document text
    • http://eunlocker.com/Images/Editor/file/12488091434.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/jukemukuwagumeg.pdfIn PDF document text
    • https://malayalamfoundation.org/admin/my_files/file/narenenejomep.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210915194433.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=coraline+neil+gaiman+book+pdfPDF 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_off0000d89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89F 10836 bytes
SHA-256: e639ea8f321a04a62c3626ace6d118963d8b87f4f16c515b682dd2ebd1e995b1
font_01_sfnt_off0000f11e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11E 17728 bytes
SHA-256: faba3464d30619443f074a92b85326b8ccea7d1195b950c7e49e61ad7e5696f0
font_02_sfnt_off00011f2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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