Malicious PDF — malware analysis report

Static analysis result for SHA-256 e27ed385f54d0a66…

MALICIOUS

PDF

76.0 KB Created: 2021-03-08 17:27:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec0376f1c1829ac2c1451d03448c1ac6 SHA-1: 7ebc376a8f876527f1c8669a4a4ab120cb16c24d SHA-256: e27ed385f54d0a6675904003095a92dad69796c4a02358c2d804fb253a2f81ae
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic firing. The ML classifier and ClamAV also flagged this file as malicious, suggesting it is part of a phishing or malicious content distribution scheme. The embedded document body text, though partially garbled, contains a title that might be used as a lure.

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://jumiwimov.ru/123?utm_term=nie+boska+komedia+sprawdzian+pdf
    • https://legovizadedugid.weebly.com/uploads/1/3/1/8/131856283/jinomuvebibedidara.pdf
    • http://dunizajo.66ghz.com/curious_george_episodes.pdf
    • https://xagomutub.weebly.com/uploads/1/3/4/3/134321984/50ea05.pdf
    • https://nukimaxirob.weebly.com/uploads/1/3/0/7/130776041/5324503.pdf
    • https://cdn-cms.f-static.net/uploads/4500674/normal_5fe6556dd04ca.pdf
    • https://xabanovodo.weebly.com/uploads/1/3/0/7/130739860/5d34fffd0d00a.pdf
    • https://cdn-cms.f-static.net/uploads/4475392/normal_5fd3d67da56ed.pdf
    • https://cdn-cms.f-static.net/uploads/4443617/normal_6042c17052cea.pdf
    • https://cdn-cms.f-static.net/uploads/4377706/normal_6018bfd391190.pdf
    • https://static.s123-cdn-static.com/uploads/4455881/normal_5fe2a1140f168.pdf
    • https://lemirupuzomive.weebly.com/uploads/1/3/2/8/132814022/ce6037a809eb0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c7f5af1d-ca5c-4bdd-a296-5d77f3b4b60c/sierra_25-06_load_data.pdf
    • https://cb8582fb-ab29-4f13-bfd4-623ca244ab52.filesusr.com/ugd/d61b30_7d4ac9f247d146b0a223fad99398653d.pdf?index=true
    • https://e082b6be-64c0-45f6-a8ff-82b9c6f476f0.filesusr.com/ugd/1479de_729503701acc4e8ebeca743cc9011c21.pdf?index=true
    • http://ribafaga.rf.gd/fipefojezikirele.pdf
    • https://4e4301d6-cc9a-4939-960a-6b497c1efea6.filesusr.com/ugd/d78803_d9711f87699c483695700670317dbf07.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a5f68ad5-e12e-4455-bc9b-f677b13eb497/sowonafivateleduzif.pdf
    • https://52c77544-2eb8-427c-ad0e-a8a7e2ea9366.filesusr.com/ugd/93288f_0907cf30eeda4952bb93677091f08087.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7209c4f1-f472-41bf-9538-728c0cc7d1ef/stack_on_pistol_safe_code_reset.pdf
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_2f29b1924ae9487a819eeac0668f0bbe.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_off0000e9e3.bin
edf16f74a9679e69e2ba80d27020b3fdfc3ae5b4fadf74e41c75a5e943fd12a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E3 5468 bytes
font_01_sfnt_off0000fc85.bin
6c920e4e77b6671f5d2f4744fff08ea6bd06b017afc3771b79b2f193abcd2f27		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC85 11580 bytes

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