Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec7c3370a0aa5968…

MALICIOUS

PDF

69.8 KB Created: 2021-04-21 01:02:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: f29bb2fc41b5b912b84021d5faab1177 SHA-1: 25c20334d03072ef7757dd2edbb614d3980ee863 SHA-256: ec7c3370a0aa596891c041420567e0cac898b16e3fc6001e01d36e085a94d736
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains heuristics indicating it is a phishing lure, specifically using an image to redirect users to a malicious URL. The embedded URL and the ClamAV detection strongly suggest malicious intent, likely to deliver a phishing page or further malware. Although no scripts were explicitly extracted, the PDF structure and URL redirection are indicative of a common phishing or malware distribution technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://jumiwimov.ru/strik?utm_term=engineering+circuit+analysis+6th+edition PDF link annotation
    • https://cdn.sqhk.co/polopomoset/9hav3jj/nisedimugorobofarusifavu.pdfIn PDF document text
    • http://avlto.best/tri_tronics_classic_70_xlsv6ict.pdfIn PDF document text
    • http://checkmyscore.info/cg_gali_video_2018az4ga.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377905/normal_5fe24f38e4928.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428043/normal_5fccab67cdcae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387562/normal_6039777db92db.pdfIn PDF document text
    • http://sunufosabupes.scienceontheweb.net/81465496234.pdfIn PDF document text
    • https://cdn.sqhk.co/jojojidatun/gg9pZgd/harvesting_strategy_definition_in_business.pdfIn PDF document text
    • https://xipumizi.weebly.com/uploads/1/3/4/7/134746986/lometupatunimeba.pdfIn PDF document text
    • https://wesuzijuto.weebly.com/uploads/1/3/0/7/130740493/5514402.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495058/normal_5feb617292973.pdfIn PDF document text
    • https://jutebipofan.weebly.com/uploads/1/3/4/3/134334370/ludasavuxib.pdfIn PDF document text
    • https://cdn.sqhk.co/dibidoretu/ehjhfGn/wpf_gridview_celltemplate_example.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417205/normal_6033c27f486dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392667/normal_5ff024ba23c9d.pdfIn PDF document text
    • http://bovewitavivebu.getenjoyment.net/70141465956.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459774/normal_601e102f6983c.pdfIn PDF document text
    • https://cdn.sqhk.co/foletesubuf/chaQRjd/discovery_family_go_shows.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484999/normal_5fcf8af2df04a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gizixaxeviduf.myartsonline.com/the_bronze_horseman.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_off0000d279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD279 5416 bytes
SHA-256: cd70b7d5549bbd293777e66d1c612b1ce9e152c23c4f09bb011124102617bef2
font_01_sfnt_off0000e4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EB 10828 bytes
SHA-256: e3909eff257ca0be48846d804a4f4f535f02153729eef0c66e964cb2c9cc8eaa

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