Malicious PDF — malware analysis report

Static analysis result for SHA-256 538982a8d149962c…

MALICIOUS

PDF

113.0 KB Created: 2021-06-09 09:46:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37346d1ed747eb8f476adba06181b964 SHA-1: c4ebe1984b74b4f51a7e1a8b35ffc0cfe958d230 SHA-256: 538982a8d149962c55adb562efa69b573b8a3de8f7965ba950d305b95a9f9d3f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to manipulate search engine results or redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate maliciousness, with the ClamAV signature pointing towards phishing and trojan activity. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/pbw?utm_term=lost+and+found+bluford+series+summary
    • https://sojebubibofanex.weebly.com/uploads/1/3/4/5/134512436/486e5234.pdf
    • https://cdn-cms.f-static.net/uploads/4381289/normal_606964630a03e.pdf
    • https://cdn-cms.f-static.net/uploads/4379379/normal_60bc5610bbb81.pdf
    • https://penixosifa.weebly.com/uploads/1/3/1/4/131482878/18936.pdf
    • https://xowivana.weebly.com/uploads/1/3/0/8/130813667/3621901.pdf
    • https://cdn-cms.f-static.net/uploads/4404108/normal_60247fbbea4d0.pdf
    • https://static.s123-cdn-static.com/uploads/4415524/normal_600529a26e143.pdf
    • https://cdn-cms.f-static.net/uploads/4454694/normal_60347a2b45b06.pdf
    • https://cdn-cms.f-static.net/uploads/4451230/normal_5fd9e9e32a575.pdf
    • https://josozigigararu.weebly.com/uploads/1/3/2/6/132681886/1265800.pdf
    • https://static.s123-cdn-static-d.com/uploads/4375894/normal_60b19cdf0bc51.pdf
    • https://cdn-cms.f-static.net/uploads/4405443/normal_5fdbc943a65e6.pdf
    • https://cdn-cms.f-static.net/uploads/4486983/normal_601b425b46d43.pdf
    • https://cdn-cms.f-static.net/uploads/4483082/normal_605b1e9913436.pdf
    • https://cdn-cms.f-static.net/uploads/4424040/normal_5fe678539846e.pdf
    • https://static.s123-cdn-static.com/uploads/4426279/normal_5ffb66ee7e721.pdf
    • https://cdn-cms.f-static.net/uploads/4470826/normal_6013332132007.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6ebb619e-6fa3-4513-afc8-8ba254f7932f/sesaxe.pdf
    • https://uploads.strikinglycdn.com/files/e753bbca-fdbb-47d7-a0c7-c5b187a6e153/34944270615.pdf
    • https://uploads.strikinglycdn.com/files/b2c1deec-cfe1-4ded-b359-1083e15663a8/22027043161.pdf
    • https://uploads.strikinglycdn.com/files/035b8423-3c1e-4f69-95f8-fd2991f32ddb/xasofupiwuve.pdf
    • https://uploads.strikinglycdn.com/files/af796cd9-7df3-4c9e-9a9e-af4ff13e302c/mathematical_statistics_notes.pdf
    • https://uploads.strikinglycdn.com/files/7143c0a6-8701-4d9a-a853-b72495d034f7/4066635830.pdf
    • https://uploads.strikinglycdn.com/files/6aeda4ce-9dd6-4667-8e65-6098107e8599/what_do_freemasons_teach.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001683a.bin
697847ca798724e65cd2e76cdf88e4aba9ddfa210757d7d98e754233e4461eb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1683A 5236 bytes
font_01_sfnt_off000179fe.bin
43247025242097d7c45748c52d1a7a9e84b2ab12db9ee2b15259bdbbb9a14445		 pdf-font-stream PDF embedded font (sfnt) at offset 0x179FE 11288 bytes
font_02_sfnt_off0001a0ad.bin
541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A0AD 16204 bytes

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