Malicious PDF — malware analysis report

Static analysis result for SHA-256 e21b28fdadcca64e…

MALICIOUS

PDF

75.5 KB Created: 2021-03-28 21:06:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: ea5d5bb524583717fa07199ebe76027a SHA-1: 2150c321874b9a39088fd82ed8c5fa81a5eae6b7 SHA-256: e21b28fdadcca64e5d4d145392c7422c47bbb62fb634b5043de8a34e6d9034bc
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, with a high ML classifier score and ClamAV detection indicating malicious intent. The document body, though heavily obfuscated, suggests a lure related to 'orchitis pdf usu' and the authoring application indicates it was generated by wkhtmltopdf, often used for SEO spam. The presence of embedded URLs and the link farm structure strongly suggest the document is designed to redirect users to malicious or spam content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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 https://maypoin.ru/award?keyword=orchitis+pdf+usu PDF link annotation
    • http://alteramaks.world/damoduxosiwewo0kj4y.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465907/normal_600cc3878511a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405184/normal_5ff192d6688bc.pdfIn PDF document text
    • http://sale50.pro/12285715295pby5u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446502/normal_602fd83e0308e.pdfIn PDF document text
    • http://ampinternational.org/fasunutilufulawedo4vykw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377100/normal_604f3536031a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476268/normal_5fd7cada41578.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422890/normal_60384895ea9dd.pdfIn PDF document text
    • http://acgmgroup.ru/wind_turbine_advantages_and_disadvantages_gcsee12x2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420039/normal_601fb599aef03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419195/normal_604305bc27d2c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388274/normal_5feba4ce72a1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489415/normal_60273571c2907.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373004/normal_5ff3a312291fe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485156/normal_5fca412558054.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ac6a5e95-3fab-4d4b-a7e7-0ef4c71e5929.filesusr.com/ugd/32c278_7e4c841d0cac45bebe708ff9912a106f.pdf?index=trueIn PDF document text
    • https://1b6fe947-be7e-4494-9a94-f566f178d3d1.filesusr.com/ugd/89064d_96d6437ee83f4308b259514629e114cd.pdf?index=trueIn PDF document text
    • https://332892e0-6a2b-40ad-946e-e7c92c61c867.filesusr.com/ugd/3e5d97_54585d654dd340f39b035c936c774a1d.pdf?index=trueIn PDF document text
    • https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_7431e46f359d4a5b9bb0cde8a8957553.pdf?index=trueIn PDF document text
    • https://c5e26362-acc3-4c40-9db4-ce0cbd355080.filesusr.com/ugd/681527_66b8ae0e998a4eaeb0051e451ff830a1.pdf?index=trueIn PDF document text
    • https://18e99e0c-7034-4a8c-9069-267580a295b8.filesusr.com/ugd/b337f5_1259004c05e940b4b64c0d77b606ffa9.pdf?index=trueIn PDF document text
    • https://b724dda4-e2e0-47c5-811c-ae3b7273578b.filesusr.com/ugd/a1e5ee_731d0be00fd54373992819bdf468aab3.pdf?index=trueIn PDF document text
    • https://234d5d8d-19c9-4cab-a884-dd0775662658.filesusr.com/ugd/fb7225_0d557da4adf747cebc2e1d70b16650d3.pdf?index=trueIn PDF document text
    • https://40ba1f7a-6e91-49bb-bbb8-dfbb40a2bc60.filesusr.com/ugd/22bf55_ef6b878438d34803a38d9c35311b0bd7.pdf?index=trueIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A6 5028 bytes
SHA-256: 2c72bc013db58141cc999943e1f93c96bb8a02593aa43c01cc2040c8395ab08b
font_01_sfnt_off0000f8bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BC 12116 bytes
SHA-256: eeb828b1ea2cf3fe3dc2cc3ce8d7b53ec9a1d5955a56e6adcb9a0804499de3d1

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