Malicious PDF — malware analysis report

Static analysis result for SHA-256 e09c932fa90104a8…

MALICIOUS

PDF

76.3 KB Created: 2021-01-04 20:06:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd52563b90799b6daae79f634273bcf9 SHA-1: 77d95a9c9c9d16575e6ef599cf8ef85422563f72 SHA-256: e09c932fa90104a8b8e6ae6e072ebe792358af3e5c292e3921b7a6f0a9b80ef9
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of embedded external links, with one pointing to 'trafftec.ru', suggesting a potential phishing lure or a link farm for SEO manipulation. The presence of multiple PDF links and the ML_NYX_PDF_MALICIOUS heuristic strongly suggest malicious intent.

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-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://trafftec.ru/aws?utm_term=diy+dremel+router+guide
    • https://static.s123-cdn-static.com/uploads/4454303/normal_5fca521bbee89.pdf
    • https://faneboluti.weebly.com/uploads/1/3/4/4/134464249/kabufudusasaxu.pdf
    • https://fapojenulexo.weebly.com/uploads/1/3/1/3/131383319/7707074.pdf
    • https://cdn-cms.f-static.net/uploads/4380700/normal_5f9b2a21a47b6.pdf
    • https://mupibidegupek.weebly.com/uploads/1/3/0/8/130874042/5c3862a640e9f.pdf
    • https://cdn-cms.f-static.net/uploads/4393489/normal_5f8fb92c6d682.pdf
    • https://static.s123-cdn-static.com/uploads/4402707/normal_5fcea6f87712c.pdf
    • https://dapevorejux.weebly.com/uploads/1/3/4/6/134695165/6660331.pdf
    • https://paguzijap.weebly.com/uploads/1/3/1/4/131453408/34bb4969e43.pdf
    • https://jamafijuzu.weebly.com/uploads/1/3/1/4/131437216/4050132.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/7d72d21a-67ad-4638-a680-d0ce7fae863e/livewawagivun.pdf
    • https://uploads.strikinglycdn.com/files/0cde0a5b-6fc9-4f44-8da0-47e5fce4093d/tugepoxukalevojakekomejaz.pdf
    • https://s3.amazonaws.com/jarawaxanivu/fakomanurudipitosovex.pdf
    • https://uploads.strikinglycdn.com/files/0fc74687-f75a-45a1-bea2-dd0a24bc6f2b/89762970339.pdf
    • https://s3.amazonaws.com/fulosobezur/green_bay_packers_davante_adams_injury_report.pdf
    • https://uploads.strikinglycdn.com/files/4d48293f-2a5b-441a-a2f4-533630329d75/33362077882.pdf
    • https://uploads.strikinglycdn.com/files/0335ace5-c18f-47eb-b607-4e933f17ce41/logogim.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e25c.bin
ea830e6b606c12ff9110bd8e2a6c1a353c83eb5e4615da379157da8149dbefc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE25C 4636 bytes
font_01_sfnt_off0000f22c.bin
52cbaca9b3f7831db9889c9a25eb5dad3e541da9fa6d67e860af110c0b9be5e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF22C 10424 bytes
font_02_sfnt_off000115ee.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115EE 4324 bytes

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