Malicious PDF — malware analysis report

Static analysis result for SHA-256 618dd5c3335d7e2a…

MALICIOUS

PDF

79.9 KB Created: 2021-09-23 19:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 98d90aa919b468e3d7f9ed554a42d097 SHA-1: 8695b455bd70b1fb1bc260d5f282a2949fd02487 SHA-256: 618dd5c3335d7e2a2e01c08de66f962fd157c9b702af09eacb14afe2fcfcb9f1
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, with one heuristic specifically identifying a link farm on disposable hosting. This suggests the PDF is designed to redirect users to malicious content, likely phishing pages or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • 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.
  • 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://brlairport.com/images/file/romibejaguzisurijadawuk.pdf In PDF document text
    • http://uralteplostroy.ru/content/file/99996631872.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/30166811469.pdfIn PDF document text
    • https://institutdesante.org/userfiles/file/99607324595.pdfIn PDF document text
    • http://whipitleather.com/userfiles/file/34314372498.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/20408581847.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/87956319684.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/46374179169.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/katonawixabifapivolilil.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/fomogetazokutuk.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/39223705091.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/3967772027.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/71592948253.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/wurosarofejegajibajagewon.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/8536664930.pdfIn PDF document text
    • http://zimmerei-possert.at/98852829915.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109162033076765.pdfIn PDF document text
    • http://umbabox.com/userfiles/file/53806335542.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/82632170610.pdfIn PDF document text
    • http://charivne.info/images/file/64255397646.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/tolaz.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/14898067929.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+change+language+on+android+phone+from+spanish+to+englishPDF 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_off0000d22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA42 11244 bytes
SHA-256: d5a8c0cafda2564f7eb04004fc2b04b553b068fcc325e2be379a2eee741f6ef4
font_02_sfnt_off0001043d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043D 17864 bytes
SHA-256: 29b2f698d80cf18a1cce3b4404c4ceab89a96587bbf3e8f83b67936b867b9f3a

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