Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fb49f2e1c0abe96…

MALICIOUS

PDF

76.6 KB Created: 2021-09-13 08:19:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 33b7c334e5fe7da944cc07c4cd9cde82 SHA-1: 24bed1f74770171eeefce6de5ccf3f30a8f330d6 SHA-256: 4fb49f2e1c0abe96735986e20ea1a09440c80dd58b191f4748e240ba682d1525
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm, indicating a potential SEO manipulation or distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the presence of a link farm on disposable hosting, suggesting a malicious intent to redirect users or manipulate search results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://asupuro.com/upload/save_image/files/kifumuxutod.pdf In PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/10158934952.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/nozadusewexuvalanoxiwige.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/28476261154.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/ponigepu.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/jabexumilapumixudok.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/59928278827.pdfIn PDF document text
    • http://kccmaul.com/files/files/95717360889.pdfIn PDF document text
    • http://qqwandai.com/uploadfile/file/24661524092.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/85145992893.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/jatile.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613e92ba47f94---80611838262.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/62629659822.pdfIn PDF document text
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/70684312711.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/8651549650.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/nuzikozepubitu.pdfIn PDF document text
    • https://bloc-immo.com/images/fuxetetelitopogeme.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/15616820873.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/risofunowafopu.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/razozaka.pdfIn PDF document text
    • https://2winit.com/Files/files/14816390355.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=relative+pronouns+exercises+onlinePDF 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_off0000c81b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC81B 10680 bytes
SHA-256: 26232a34fd3f6f3eff80e55bd068cf83198a70e1a2d4027f2e60c7cc4a66399b
font_01_sfnt_off0000e0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C0 17184 bytes
SHA-256: 5ffba007be4994bc2c789ea2b4706b2f7389457268c7700393acac4ec0babd23
font_02_sfnt_off00010cae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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