Malicious PDF — malware analysis report

Static analysis result for SHA-256 3da4272983f3528f…

MALICIOUS

PDF

70.4 KB Created: 2020-11-10 10:38:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 437893aa303ecf9708620533b9db0bc2 SHA-1: 9d1dd7a33477cc0ef6df8db9dd7d3c259a0b24e4 SHA-256: 3da4272983f3528f4d950add38621db5c36bec6c1c8b646f6715d474cce40358
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-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://traffking.ru/123?keyword=to+kill+a+mockingbird+webquest PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379987/normal_5f9eee1f86a47.pdfIn PDF document text
    • https://tuvozejuwubox.weebly.com/uploads/1/3/4/3/134323710/nazapafazoxugip.pdfIn PDF document text
    • https://winomumamo.weebly.com/uploads/1/3/1/0/131070375/7987181.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420013/normal_5fa3b98f3bdf9.pdfIn PDF document text
    • https://tozarezev.weebly.com/uploads/1/3/4/3/134374844/lamijex.pdfIn PDF document text
    • https://rikurifijuse.weebly.com/uploads/1/3/4/6/134681474/6140466.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/c16335b3-6aa7-436f-b2da-b86025eb422f/dramacool_my_golden_life_ep_30_eng_sub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd812498-28c4-4cb8-8c0d-b246fda84bd2/vovodixefotegiwoso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40e5c751-d938-4f0c-8fa1-cfe1667bad8a/9826155001.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7b5b302-b778-40c5-b310-3356f19ce101/wuvalikefefisuduzapuzoku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c380e61f-4dd4-4e34-9f94-f26c0602050a/kejugegapobav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d8e9b26-04de-4975-bb0c-bb13dc8c36ab/34273715151.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b862ba18-488b-4059-b5e2-1bc10269e7da/1141746289.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e16ea88f-7c4f-4d6a-9d55-79e1030f4718/35544678821.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/823368ea-1b2a-48a2-b75c-7847f37cde52/bt_2020_vs_adobe_rgb.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD581 5632 bytes
SHA-256: c1d94855ec9433c412510bd454fd2cb5aa179f5330c78bb9bb18ce0e6c231e8d
font_01_sfnt_off0000e894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE894 10548 bytes
SHA-256: 015e391668476125bff9f1a596a96f5e8f946727108c9004c24b8a58e03515be

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