Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0952cb7cb55626e…

MALICIOUS

PDF

74.0 KB Created: 2021-02-11 15:31:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: df47aa7f0d776365e69a42a5778d3ab0 SHA-1: 9db2516868655116c58444cf3387af9e201b5af3 SHA-256: b0952cb7cb55626e6dbe6e7a9412c83468947b8742384a80210601574479d1ec
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, flagged as a 'PDF_SEO_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly indicate maliciousness, specifically a phishing or trojan variant. While no scripts were explicitly extracted, the presence of numerous external URLs suggests a potential for downloading further payloads or redirecting users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://seumenha.ru/123?utm_term=alaska+battle+of+the+books+2019 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4463803/normal_5fef62160ee7c.pdfIn PDF document text
    • http://smallita.space/flicker_free_serial_macum24t.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368760/normal_5ff8586782564.pdfIn PDF document text
    • http://moviesaddaa.online/cmos_4081_datasheety399y.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457582/normal_5fd7b3a2cee6f.pdfIn PDF document text
    • http://winwites.space/christian_haggadahfd7ay.pdfIn PDF document text
    • http://gasiwine.iblogger.org/52655843589.pdfIn PDF document text
    • https://pelimabogex.weebly.com/uploads/1/3/4/6/134685965/jenatasas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443588/normal_5fefa1df8c893.pdfIn PDF document text
    • http://blubadgehelp.net/197105395896yrik.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://getakufo.epizy.com/elite_dangerous_combat_ships_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jivagajamav/kovaresewitabikapiviz.pdfIn PDF document text
    • http://dokedajonanumi.rf.gd/84339560499.pdfIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/39044344110.pdfIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/pidebowomixo.pdfIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/vizijitogipimo.pdfIn PDF document text
    • https://s3.amazonaws.com/dinilederu/15626735260.pdfIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD636 5068 bytes
SHA-256: d3953f23dabfbf5a843fc00f2867ceb9750f925b5ace6d21cc336d147b3e88f2
font_01_sfnt_off0000e77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77B 10960 bytes
SHA-256: 3ef37fe1de4094a723065e20897e19a994122406ed027fc037b67213ce95ece2
font_02_sfnt_off00010cc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC7 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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