Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a51d906ded3d5af…

MALICIOUS

PDF

76.2 KB Created: 2021-03-24 21:27:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 085d6408683f8d0dbe0d13a1ff892700 SHA-1: 6001341481b8eb42a1940d54b693ff335c8633f3 SHA-256: 3a51d906ded3d5afa1bc7bcaf3857344826c758f170fbdbc5feb76cfd28415c5
156 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a primary link to 'vilenefex.ru', suggesting a link farm or phishing attempt. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the structure of the PDF indicate it is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/wix?keyword=the+lost+symbol+pdf
    • https://cdn-cms.f-static.net/uploads/4471711/normal_6059161554d10.pdf
    • https://cdn-cms.f-static.net/uploads/4443329/normal_6013c1455b1ca.pdf
    • https://static.s123-cdn-static.com/uploads/4450511/normal_5fe1070f340f6.pdf
    • https://cdn-cms.f-static.net/uploads/4485446/normal_601f863e9874e.pdf
    • https://cdn-cms.f-static.net/uploads/4463300/normal_60582354161ee.pdf
    • https://cdn-cms.f-static.net/uploads/4468536/normal_5fd66f7c65f97.pdf
    • https://cdn-cms.f-static.net/uploads/4366045/normal_601eff9e70020.pdf
    • https://cdn-cms.f-static.net/uploads/4387939/normal_60362ced1fb3f.pdf
    • https://static.s123-cdn-static.com/uploads/4477916/normal_5fde28f101968.pdf
    • https://cdn-cms.f-static.net/uploads/4402720/normal_600aa32c41b4e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://aa3bb5c3-2bd4-4791-9e2a-6e31d5009b04.filesusr.com/ugd/60e703_0f3027da537c463f9bc923dbe28e9de9.pdf?index=true
    • https://507d1b22-ea03-4061-a262-f79425337ca2.filesusr.com/ugd/a374b9_f3c519b8a1944e93abe3a513a7721149.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6862563e-6d8a-49da-885e-88668b442517/euro_pro_x_sewing_machine_threading.pdf
    • https://uploads.strikinglycdn.com/files/ea8ac507-7ff8-4e6e-abc5-5ea86fca08eb/requirements_for_solo_parent_id_makati.pdf
    • https://86b7bb9a-6a0b-496c-a062-e8aa60c365d0.filesusr.com/ugd/dcf311_e916ee73766848829e4088f076c3685d.pdf?index=true
    • https://2386e270-bd20-42c1-b3e5-1ba7eaa1d68d.filesusr.com/ugd/b4f0c6_a6ee9494ab5249e1977fdcadce561642.pdf?index=true
    • https://5071cc05-3fa2-46b1-b944-d2523ca4b51d.filesusr.com/ugd/62e2c1_8e581d0547104dec83464231c1ed4d61.pdf?index=true
    • https://ec5c17a1-061e-4a2c-a9e6-b3561ba71229.filesusr.com/ugd/299074_158c4091c2ba4d75ae635160fd4841ae.pdf?index=true
    • https://uploads.strikinglycdn.com/files/843bbbd3-bbd5-4f7d-b250-28e348d80016/22621747371.pdf
    • https://c145ee04-3c3b-4786-8b94-e0511401b322.filesusr.com/ugd/de65f7_085d10ced0ff43b1b3a3c48c2605a056.pdf?index=true
    • https://235a1a37-2bc9-4d3b-8f1d-d3952ad9fba8.filesusr.com/ugd/3111f7_0dcdcaa399c9464baeebe8280ced572e.pdf?index=true
    • 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_off0000ee26.bin
4c16025a14b70d9109dc36c4d9dce880283cb666b7b32f445ca552e133c94dbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE26 5164 bytes
font_01_sfnt_off0000ff97.bin
455342de6cb3c9cff5e4983bf6faac356df72c2e004ac89bbc3c7dfaccf569d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF97 10644 bytes

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