Malicious PDF — malware analysis report

Static analysis result for SHA-256 20238ba3010351e4…

MALICIOUS

PDF

85.4 KB Created: 2021-09-20 01:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a74ccab6f26b7b44588e0e4eadc1fd70 SHA-1: 836fd0c861f727f12d9672dde9c3e98b01ebb9e0 SHA-256: 20238ba3010351e4964fff5a3c5a970e69762b2d9575a7943ad764cf3077c6db
134 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which are hosted on disposable domains, indicating a link farm designed to obscure the true destination. The presence of a 'Download Now' heuristic further supports the idea that the document is intended to trick users into downloading a payload. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://sieuthibds.net/images/files/gugugopefodop.pdf In PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/68278483328.pdfIn PDF document text
    • https://nitdgp.ac.in/uploads/userfiles/files/26686031960.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130882d1ac21---wunagizakuk.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/74358157831.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/nixitulazuzomipiz.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/98289572775.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/70355637618.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/632576864.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/61144301156.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/79000645851.pdfIn PDF document text
    • http://elektro-galerie-hamburg.de/userfiles/file/76531077914.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/duzedepodiwivib.pdfIn PDF document text
    • https://it-remarketing.pl/app/webroot/media/files/63039852658.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/10763027475.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/96544197715.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20210910111040.pdfIn PDF document text
    • http://cutskytools.com/d/files/zulubaxokavakomonunorolem.pdfIn PDF document text
    • https://kultmotor.hu/images/files/38142290014.pdfIn PDF document text
    • http://www.protectakoteasia.com/ckfinder/userfiles/files/15374326085.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/59350826155.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=epic+cricket+mod+apk+downloadPDF 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_off0000e933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE933 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10145 17856 bytes
SHA-256: a9bd172d5eb75988fbb5eb12b9b92e8f76922231e1d1c23f05ef1e2877e566e3
font_02_sfnt_off00012ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF2 10668 bytes
SHA-256: 217d24e5c696dd1ceb22c3f3e55d6145a2b13cb557bb9588f0842b19ef29419a

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