Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fbf16f348b5ef4c…

MALICIOUS

PDF

80.3 KB Created: 2021-09-19 22:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f4fb302d28d710c52c1f5dda9e48df4c SHA-1: 34e6a2495a4305368011d13103bf83a8e8cdc55e SHA-256: 9fbf16f348b5ef4cb4a53d7b2b28ef010888ba726a8c374e3cba424e846a5449
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are algorithmically generated and hosted on disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure points to a common tactic of using malicious documents to lure users to compromised or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://coretry.ru/uplcv?utm_term=vidmate+old+version+3.03+download+apk PDF link annotation
    • http://aasghsflqsae.handylover.com/upload/files/82351533311.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/fafariduxalosujiwoxula.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/xedevukopuxevame.pdfIn PDF document text
    • http://mpti.ru/userfiles/file/78293160336.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/pusupafizafuwiloboge.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/43821c39df76a2ce991ddedbb3c70339/jikuvupaseda.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/samewafitusamuj.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/kukepuzenivekomufapo.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/kuxawonidejapemewiwub.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/xuvametoj.pdfIn PDF document text
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/52330229766.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161312e17a856a---89905232153.pdfIn PDF document text
    • http://rrarental.org/upload/file/moferunojegemivusosimom.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/95594952617.pdfIn PDF document text
    • https://rosanaalvarracin.com/userfiles/file/nevefisaguvo.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/2090833797.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109121954226839.pdfIn PDF document text
    • http://flomojapan.com/upload/files/lexage.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/73752342727.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/pivetupokimaxo.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/41181833212.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/jovale.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_off0000d6f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF09 11124 bytes
SHA-256: 0cbaca30bdfe7c886b5d4267a42c0d2b1e3f0a692df5208627651a6552332c92
font_02_sfnt_off0001090a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090A 16768 bytes
SHA-256: 04e22274a8e6a43a02ba47b1ebb08f45abbe05992d0ceb50a27a49f6ececba99