Malicious PDF — malware analysis report

Static analysis result for SHA-256 646df95198c0119f…

MALICIOUS

PDF

73.6 KB Created: 2020-11-23 12:33:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3d2a218e0e8722343c9361e15f2872d9 SHA-1: 1806f917f74184d277c8f1fb971684ab5b4053f8 SHA-256: 646df95198c0119f8ff5d845fe68c69a1d4981b5818ac7814201c6c78b40c342
176 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of embedded external links, suggesting a link farm or phishing attempt. The ML classifier also strongly indicated maliciousness. The document's primary function appears to be directing users to external URLs, likely for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://traffnew.ru/123?utm_term=mrs.+kitchels+world+of+information
    • https://cdn-cms.f-static.net/uploads/4378848/normal_5f94a060eee08.pdf
    • https://garisufusomepis.weebly.com/uploads/1/3/0/7/130740000/97ecf908cfd68a.pdf
    • https://cdn-cms.f-static.net/uploads/4367283/normal_5fb00ea379a61.pdf
    • https://cdn-cms.f-static.net/uploads/4461250/normal_5fa86f2906f6b.pdf
    • https://cdn-cms.f-static.net/uploads/4419654/normal_5f992a94418b1.pdf
    • https://cdn-cms.f-static.net/uploads/4423454/normal_5fa8c4fcd2960.pdf
    • https://cdn-cms.f-static.net/uploads/4374852/normal_5fa7d3d530b95.pdf
    • https://depumubawaminuk.weebly.com/uploads/1/3/4/2/134236244/1501018.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e2dc7a60-38fc-4f13-ab88-1f0b0b55e70e/unblocked_unreal_pix_city.pdf
    • https://uploads.strikinglycdn.com/files/661451d6-9a07-4a80-9897-2b9e1c30561f/semekulexirirevivuj.pdf
    • https://uploads.strikinglycdn.com/files/6ab1a99a-28a5-4a0a-9f67-c59dca8f2618/nituroxukerera.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_off0000ccd8.bin
9277447fe2cc8356092f81f52c66c9dfbe319c46e884550b443ec48920932fdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD8 5456 bytes
font_01_sfnt_off0000df5f.bin
b41cede9bc12c269a55ddfcd63ad222422d5914f7a1a786962efb137a758c491		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5F 10912 bytes
font_02_sfnt_off000104bf.bin
ff35cc95952237f3a41fd4e65f8431fd32f7c163190b6885d505d64bfdc073ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104BF 16060 bytes

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