Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb84282519227d30…

MALICIOUS

PDF

72.2 KB Created: 2020-11-12 21:40:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: b53f26e6dff186cd95a9cb23f4179c7c SHA-1: d7d13ddb20c514c2b682c69309008e81fe0c952a SHA-256: cb84282519227d30f0ba3ef3662dbaa17c40ee8c0be82fd28924382e9380fbbf
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffnew.ru/aws?utm_term=curative+medicine+pdf PDF link annotation
    • https://nuzilemuf.weebly.com/uploads/1/3/4/4/134479477/babotesu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375541/normal_5f8f55058fac2.pdfIn PDF document text
    • https://besogedawifajop.weebly.com/uploads/1/3/4/2/134234635/pugidived.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385020/normal_5f9e8a72d0031.pdfIn PDF document text
    • https://sasikivi.weebly.com/uploads/1/3/4/4/134462450/levasisifam.pdfIn PDF document text
    • https://gesoroserazam.weebly.com/uploads/1/3/4/3/134310447/6358896.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a3cbb92-0474-4d89-bc53-785a58a47124/ripodapivevewalatefelopup.pdfIn PDF document text
    • https://s3.amazonaws.com/titugome/43694905437.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/diteg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76f40c74-0ca0-4866-81d1-541bd530d77b/visulalaxojimumovugaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e181bc4f-6ba2-484c-ab34-f360433077e3/homemade_analog_synthesizer.pdfIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/xumuravum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f88b495-6d39-461a-8c79-f9cf9ecc7b31/labekesatexolo.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_off0000cba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA5 2856 bytes
SHA-256: 4d00d9a42b8c0a6281c6f91ecd2d6619cfd6d2fee89e9d65d4cff6ecb559f56b
font_01_sfnt_off0000d5cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CF 5056 bytes
SHA-256: 443cb703b75e1dad570aa7e68ccd3827df52d93a27dea2cec04ea2543519093e
font_02_sfnt_off0000e6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EE 14768 bytes
SHA-256: ad4cf887a86fdc2dd6f75cf4afe5587abf518a9074dd66a37aaac9689b768ad7

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