Malicious PDF — malware analysis report

Static analysis result for SHA-256 f72c76fc553a8345…

MALICIOUS

PDF

47.7 KB Created: 2020-11-08 01:35:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: e85b4513423e70d70d7eec1f2737a208 SHA-1: 5c7de069ee4b6789482362032648532e774d918a SHA-256: f72c76fc553a8345abe8b5c2f43c1e580c716a459fd570da4011c3513779a9d8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a link farm designed to redirect users to malicious infrastructure. One critical heuristic identified a link to a known malicious redirector, suggesting an attempt to lead the user to a compromised or malicious site. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffking.ru/aws?keyword=card+conditions+yugioh In PDF document text
    • https://barofabilis.weebly.com/uploads/1/3/2/7/132712093/nosesevazosizomoz.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/9294e884-a897-45f9-afaf-619033857265/planeacion_nuevo_modelo_educativo_preescolar_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd6ba330-10e9-42c6-b13c-730168002f01/puwotomerorotimoxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bef43cd9-7a53-45e4-aab3-82aa18c205f9/41412658167.pdfIn PDF document text
    • https://kumapimu.files.wordpress.com/2020/11/the_handbook_of_rife_frequency_healing.pdfIn PDF document text
    • https://s3.amazonaws.com/banijugoniragom/gesibululikinite.pdfIn PDF document text
    • https://bowoxejiru.files.wordpress.com/2020/11/financial_ratios_analysis_and_interp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dc2465f-5f00-4e80-b252-f61cec724036/segarinawobupituxa.pdfIn PDF document text
    • https://dagirivemaj.files.wordpress.com/2020/11/59474233901.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce5dfe32-9bc6-409c-a27b-c54c7d943bae/149782744.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43d55c36-53fa-407b-afcc-b9e341a09e46/25174899614.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/91016587801.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/delezotiwolitulufotari.pdfIn PDF document text
    • https://kunasowajuri.files.wordpress.com/2020/11/investigacion_explicativa.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/gosodoforenavarosi.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_off00006ec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EC8 5060 bytes
SHA-256: 94082e6c8b44779d812fef258cc5c6c264ed21d76680bc94af4bc4f37f7e3f1e
font_01_sfnt_off00007ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FF2 10388 bytes
SHA-256: 0e3d18f70630d70a41bad951ce0cbc2e8f4b42e47b0d80ce8960daef112fcbed
font_02_sfnt_off0000a381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA381 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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