Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9226e1012a74a15…

MALICIOUS

PDF

84.8 KB Created: 2021-05-30 21:22:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: fd3711d7edbb1805349189055752ad01 SHA-1: 494bbfaca6449025b81193a0bde598230a4f9c7a SHA-256: b9226e1012a74a15dc91ea4a9e46efec104001e99010785fb86b28d392a9f173
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as 'Pdf.Phishing.Trojan'. It contains a large number of external links, many of which point to PDFs hosted on various domains, suggesting a link farm or redirection mechanism. The primary URL, 'https://resalured.ru/123?utm_term=electrostatic+boundary+conditions+pdf', indicates a lure related to technical content to entice clicks. No scripts were extracted, but the PDF structure and numerous external links strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/123?utm_term=electrostatic+boundary+conditions+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384046/normal_5fdc5057cfdfc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375531/normal_6055a013b44b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481552/normal_605acd802dfea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417658/normal_60141b9f77782.pdfIn PDF document text
    • https://gibekadizekuni.weebly.com/uploads/1/3/1/4/131452913/73f0122ac.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4415081/normal_60b27fdfa010c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420752/normal_603d1d5b2a7ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423427/normal_60517b546a678.pdfIn PDF document text
    • https://negijozizur.weebly.com/uploads/1/3/0/7/130775009/5099760.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459922/normal_5fce97b628523.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448713/normal_601d383d7a34b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477173/normal_605d1347e3145.pdfIn PDF document text
    • https://venonaneguwar.weebly.com/uploads/1/3/5/3/135398509/e95aa3fae156e8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447906/normal_6049742811e26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417413/normal_605d831e45b63.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4492918/normal_60b1972042ccd.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
    • https://uploads.strikinglycdn.com/files/ab4fd374-7f19-4fb5-ba88-13aa3a876b36/internet_download_manager_full_indir_cretsiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1a836f4-bc0d-4ce9-8816-b99c63e4f068/16556538443.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E9 5228 bytes
SHA-256: e130f8e94a264579c8d73acaccc179c4156af0d3e3dd6ccb92dcc65568db9ac9
font_01_sfnt_off0000f7b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B2 12224 bytes
SHA-256: d9cbbe89b19a4b8271ee0d739174f596bee494abb98b86a3b0380208cf2a55e9
font_02_sfnt_off0001216c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216C 16276 bytes
SHA-256: 2bcb44f028f914b46142b5c1dd0d0d8936dd7939544b27e7b9de2129fe8dfaf3
font_03_sfnt_off00013706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13706 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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