Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2f875c353ba8c4e…

MALICIOUS

PDF

66.4 KB Created: 2020-11-25 12:49:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 5e6e09c98f661269e3244741674e3d52 SHA-1: 91e96b577502a68768ed8a54d9e915f2c1f7a0fe SHA-256: e2f875c353ba8c4ee2a68ef3b2c15d72e7e796f9bace51f7c71d0be1803d165c
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://trafftec.ru/123?utm_term=animal+and+plant+cells+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453550/normal_5fa25e4dc7282.pdfIn PDF document text
    • https://rujemadatidugu.weebly.com/uploads/1/3/4/7/134747735/7880728.pdfIn PDF document text
    • https://wisefumi.weebly.com/uploads/1/3/4/6/134672277/4533ab74861e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450034/normal_5f9f040e94cfe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424007/normal_5fb6c21087621.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/424cfd9d-16ab-4ec4-abc6-993d7a298c3c/bisujexegitaxufu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75105741-df46-452c-a12d-aba96efc4e71/61148818290.pdfIn PDF document text
    • https://s3.amazonaws.com/fixararololu/banademaxedago.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/catalina_de_aragon_serie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8f6d594-29c8-4e01-b4b4-6ac042193060/3845481171.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/tizasotudotexupoworap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0429e9a-d8e5-4b7d-a35e-841893848380/zukikufetuteradivawa.pdfIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/vobak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ca59ff7-77c3-4cd4-a5e8-97600db4c6eb/what_does_app_icon_badges_mean.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_off0000c615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC615 5456 bytes
SHA-256: 645ddcb5a7272b09e1ca532f64623800886a3ff6323bec21435f281855eb5e77
font_01_sfnt_off0000d883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD883 10676 bytes
SHA-256: 1db88bb11330d79846efbe0a58b06f83cf06b1f386566ddc58bff06faf6bf171

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