Malicious PDF — malware analysis report

Static analysis result for SHA-256 45dc7bfa73815eff…

MALICIOUS

PDF

76.5 KB Created: 2021-03-18 22:16:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19af8884a521ba979d83fd0339154f92 SHA-1: 564ad4b4338b29b2a6b11ca98e1748b541388ea5 SHA-256: 45dc7bfa73815eff544085b29777b1afdb3646534a6daed75bbba35b70e9bcc4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting a link farm designed to obscure the true destination, which is likely a phishing or malware distribution site. The document body, though heavily corrupted, contains keywords related to 'instructions' and a specific appliance, likely a lure to encourage users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://vilenefex.ru/wix?keyword=instructions+for+kitchenaid+dishwasher
    • https://cdn-cms.f-static.net/uploads/4371005/normal_603c2d67255d8.pdf
    • https://cdn-cms.f-static.net/uploads/4417306/normal_604ec72255006.pdf
    • https://natedutaz.weebly.com/uploads/1/3/4/8/134850225/tuwivineze.pdf
    • https://cdn-cms.f-static.net/uploads/4489994/normal_6041861c2a23b.pdf
    • https://cdn-cms.f-static.net/uploads/4463010/normal_602a97f9242c2.pdf
    • https://cdn-cms.f-static.net/uploads/4468261/normal_5fd2ceb89e351.pdf
    • https://cdn-cms.f-static.net/uploads/4489835/normal_602ee05c9d09e.pdf
    • https://static.s123-cdn-static.com/uploads/4471474/normal_5febd7ee580b0.pdf
    • https://sopakefexije.weebly.com/uploads/1/3/4/3/134398413/288490.pdf
    • https://static.s123-cdn-static.com/uploads/4454821/normal_5ff5c703013a5.pdf
    • https://cdn-cms.f-static.net/uploads/4376599/normal_6051b7a88bbc3.pdf
    • https://gituwere.weebly.com/uploads/1/3/0/7/130740556/fovetuse_zorejarunokaxu_pipojanagemud.pdf
    • https://zupevinar.weebly.com/uploads/1/3/0/7/130739631/5295023.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://dd3528e8-ded0-4753-843e-0d3cb9f542e7.filesusr.com/ugd/4d6844_8ff1fb6a7112449f8d8e30cadc175313.pdf?index=true
    • https://aa5f33e9-793b-4807-a257-9eac84d314d0.filesusr.com/ugd/aa57b2_ab14f683749c4b72bff9c31484505cb6.pdf?index=true
    • https://4121a797-204a-431c-92a8-8e24072fb342.filesusr.com/ugd/b972d5_b0fc39443c6a4543b9afe96b92219c18.pdf?index=true
    • https://s3.amazonaws.com/wiwuxot/24768989720.pdf
    • https://s3.amazonaws.com/desekusoxi/wamaxezasijafo.pdf
    • https://c8a164a7-2549-4056-b209-d27d417f800b.filesusr.com/ugd/136d3d_027ac4a4d9694b8ebbe4d18b85a49070.pdf?index=true
    • https://96ea5dd8-6962-4d57-b29c-fb233a715e3b.filesusr.com/ugd/ac3463_4de80548f12748038842d287c7ba42dc.pdf?index=true
    • https://e510c2d5-567e-4a96-89ff-abc18316baf7.filesusr.com/ugd/8a9bcc_dc5217eaf402431e824dda5048361d77.pdf?index=true
    • https://17673d3b-e5d0-4e0e-8211-f079fadf35f5.filesusr.com/ugd/13ae68_dfb139d8b8b94b7aa2e5d74362525d6b.pdf?index=true
    • https://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_a13e026db6fb43f0a9e9ba2a2908750b.pdf?index=true
    • https://samples.audible.com/bk/tant/010765/bk_tant_010765_sample.mp3
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecac.bin
42982369af95bb07d9800f467150a675a366d20477ca12d6d4f4afcaeea10efc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECAC 5168 bytes
font_01_sfnt_off0000fe52.bin
9f64ae66c2c45e864ebd114e525312a23b378833c87598f844b370928b66a75c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE52 11228 bytes

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