Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0e449cdbe1d77e8…

MALICIOUS

PDF

74.5 KB Created: 2021-05-29 06:05:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 88f995f412f149ab655cf2671bdb0963 SHA-1: 9eb5f7ec459b708739f538a2eddce181e66772a7 SHA-256: e0e449cdbe1d77e8517769fa86f4cd1151d617c6525c54fd361d7108e0810cbd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many pointing to PDF files hosted on file-sharing services, suggesting a link farm or SEO manipulation tactic. The primary URL, https://druttle.ru/123, appears to be part of this scheme. No scripts were extracted, but the PDF structure and extensive external linking indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://druttle.ru/123?utm_term=best+graphics+android+offline+games+2018
    • https://dofenerezi.weebly.com/uploads/1/3/4/4/134446603/zamas.pdf
    • https://kewikadovus.weebly.com/uploads/1/3/4/7/134746666/5029852.pdf
    • https://cdn-cms.f-static.net/uploads/4369903/normal_601ebd78b7b81.pdf
    • https://static.s123-cdn-static.com/uploads/4420743/normal_5febe8812dfdf.pdf
    • https://duxizesojisuvab.weebly.com/uploads/1/3/5/3/135327590/9f425e1824c1.pdf
    • https://vugijivanapuxa.weebly.com/uploads/1/3/4/7/134742443/mazowovotur.pdf
    • https://nusomosuguxapo.weebly.com/uploads/1/3/4/6/134693055/joneta.pdf
    • https://manesufepal.weebly.com/uploads/1/3/1/3/131381078/lefewejepudabi.pdf
    • https://dozosiwogaw.weebly.com/uploads/1/3/3/9/133989014/7695051.pdf
    • https://basipavegisu.weebly.com/uploads/1/3/4/3/134390368/zutuwosuzakes-javixomulaf-wivikixebefozun-nasofik.pdf
    • https://ridimejaxokixis.weebly.com/uploads/1/3/5/3/135340331/xalepokewimune-pozamodexe-zumito.pdf
    • https://xexonuza.weebly.com/uploads/1/3/4/3/134305788/c0825.pdf
    • https://bivofeneduwid.weebly.com/uploads/1/3/1/1/131163561/fuvuzolelijov.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b541d351-e1a3-4e26-ae3d-8c30fbbddd5c/450487794.pdf
    • https://uploads.strikinglycdn.com/files/c583d1a3-7f2b-4975-a4fb-58012c1722dc/when_will_lexus_rx_350_body_style_change.pdf
    • https://uploads.strikinglycdn.com/files/292afef2-4ee3-4c87-ace3-72ace5b3f6f4/fojekofizodebekisaxofis.pdf
    • https://uploads.strikinglycdn.com/files/4bb39eb5-b10e-4f53-ba2d-f328a37e55d7/minecraft_11202_apk_android_oyun_club.pdf
    • https://uploads.strikinglycdn.com/files/5fd13999-0ba7-4ca1-95d7-9da14238b1ca/best_books_like_ponniyin_selvan.pdf
    • 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_off0000e46c.bin
47fb25716d6a0ed659a42372e41a33c5fde61b87bd90e375e74b817f039e9c1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE46C 6136 bytes
font_01_sfnt_off0000f92b.bin
d51c5fe8970edba335310fd452927dd1618d9541d4ab912b13940b018f575a58		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF92B 10432 bytes

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