Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c86ec3bd6c2bc74…

MALICIOUS

PDF

76.3 KB Created: 2021-09-13 22:05:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: afdfeba20346546b6459e7f0e5e35b60 SHA-1: 7e5d7bd72ae9de1d8c6d29315c2c8a804be1a021 SHA-256: 4c86ec3bd6c2bc744e649fd6675813c250d81341f968a82891ca7bb5d97369a5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. The heuristics indicate the PDF acts as a link farm, directing users to numerous disposable domains, which is a common tactic for phishing or scam campaigns. The embedded URLs and the PDF structure strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://klenderbio.com/upload/files/77229944891.pdf In PDF document text
    • http://dailymaydemtien.com/userfiles/files/43820743844.pdfIn PDF document text
    • http://ducthanggroup.com/webroot/img/files/jininibekenidojudazesunen.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/21233441701.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/76570549420.pdfIn PDF document text
    • http://loaamtran.com/files/usersfiles/files/45213497613.pdfIn PDF document text
    • http://myphamvickwhitebeck.vn/luutru/files/61480453372.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/cae4c95e76b4ca7cb26bd658009bb15b/tazuduxidezapoz.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/66377460528.pdfIn PDF document text
    • https://camphacement.vn/upload/files/bezavowul.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/88057710334.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/77942307116.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///26504702722.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/35934092071.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/jifaju.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/33085257884.pdfIn PDF document text
    • http://khmim.com/ckfinder/userfiles/files/5932009099.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/85917739447.pdfIn PDF document text
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/xupaserimiwofafim.pdfIn PDF document text
    • https://chungangroup.com/uploads/files/202109011252047662.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/17659076771.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b48f339fa---pipezafik.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/47990124337.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=monster+hunter+portable+3rd+psp+isoPDF 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_off0000c61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC61C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2E 17128 bytes
SHA-256: 3d202c37a837266a9e1db7ce0aaa311fd3d72b64a095b7218386e6e1fcf705d6
font_02_sfnt_off00010acc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACC 10896 bytes
SHA-256: 0a594e6cb3da69da9b1b883446a9c1c415fdcbf0a35301ae3df87071c4b605a0

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