Malicious PDF — malware analysis report

Static analysis result for SHA-256 21c961c5cd4c47e9…

MALICIOUS

PDF

67.1 KB Created: 2020-11-25 09:57:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: d7a7253bd843d3f4d33dae58edcaf6c4 SHA-1: 11634190d6bdb699bdfb5dd3fd7f59c96e6d59fc SHA-256: 21c961c5cd4c47e97154aaa01281ff0a1d1e31b513d6bba6bec2d953e77cde3b
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 0.9996

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://trafftec.ru/123?utm_term=bleach+soul+carnival+2+english+patch PDF link annotation
    • https://moxetutatag.weebly.com/uploads/1/3/4/2/134234950/bozirujowamexo.pdfIn PDF document text
    • https://punekoba.weebly.com/uploads/1/3/4/6/134612552/6175216.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479212/normal_5fb2f7fd26eff.pdfIn PDF document text
    • https://jofenunamupil.weebly.com/uploads/1/3/4/3/134343358/48fba773676042.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452376/normal_5fa2172092b5f.pdfIn PDF document text
    • https://xulopoxaxuwuzoj.weebly.com/uploads/1/3/4/5/134509354/jejogi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421464/normal_5fab36618f17a.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://s3.amazonaws.com/degerutisig/24600644461.pdfIn PDF document text
    • https://s3.amazonaws.com/juzinaramip/paradise_lost_book_9_text_with_explanation.pdfIn PDF document text
    • https://s3.amazonaws.com/juzalizuvar/nerosuribewazinepot.pdfIn PDF document text
    • https://s3.amazonaws.com/mikibetiv/lasusewikuxuzenag.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/piwazetu.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/67722376332.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/41343265561.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF12 3384 bytes
SHA-256: 2db013368ca79de5ea6bd4cec6ba3c1186c7ca7714bf43d6451de754a0a0d12f
font_01_sfnt_off0000bb42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB42 5316 bytes
SHA-256: 9ab57c625538d98f419b6b353d05472bceb2ee9a8d4c7652a49e977f95f6aaec
font_02_sfnt_off0000cd57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD57 10596 bytes
SHA-256: 953c82d9e00a6c59ef5bc1f9208c12da75acb90579f86accc1612119d4d4c7d7
font_03_sfnt_off0000f0e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E7 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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