Malicious PDF — malware analysis report

Static analysis result for SHA-256 6826defcff3a2eaa…

MALICIOUS

PDF

78.1 KB Created: 2021-03-09 07:56:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 19b0151e319ec8298c4972c16a0aac13 SHA-1: c65a5e25594baaf4c5c363c3ad66fecd88e1d09e SHA-256: 6826defcff3a2eaa0e76083a30f3310ab7112d7804317bd41edc1b44aef5896b
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains an external URI and a high-severity heuristic firing indicating it's an SEO redirector for free-download phishing. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the PDF structure and embedded URLs point towards a phishing lure designed to trick users into downloading further malicious content.

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://pelibifir.ru/123?utm_term=english+speaking+vocabulary+pdf PDF link annotation
    • https://niloberu.weebly.com/uploads/1/3/0/7/130739427/ponitupiwowudek.pdfIn PDF document text
    • http://kvyovk.xyz/6393069010247use.pdfIn PDF document text
    • https://laxafukiwa.weebly.com/uploads/1/3/0/7/130738625/kugeriruwe_pumiwupebef_newumixubevaj.pdfIn PDF document text
    • http://trysoda.club/27880766650e92v5.pdfIn PDF document text
    • https://cdn.sqhk.co/badaxiloru/hbXMjbH/standoff_2_mod_menu_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407807/normal_5fdd4a805d640.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464707/normal_5ffa25a086694.pdfIn PDF document text
    • https://teligodinawam.weebly.com/uploads/1/3/4/4/134457670/4612960.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382186/normal_5ff104a2ee1c3.pdfIn PDF document text
    • https://kerumeso.weebly.com/uploads/1/3/4/6/134641164/vipipekeda_pudavug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426071/normal_6037cd86d2bec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380392/normal_6003af1ea2f28.pdfIn PDF document text
    • https://cdn.sqhk.co/lopijikuvi/idvQ5ib/starcraft_2_gem_tower_defense_best_maze.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368218/normal_5ff1d642d58d2.pdfIn PDF document text
    • http://vashobereg.com/how_to_deal_with_piriformis_syndromegmu99.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471230/normal_5fed3ed58b874.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403417/normal_5fe97877048f8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376878/normal_5ffb9454b6f6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365539/normal_5fe8f896e5291.pdfIn PDF document text
    • https://komanogorolelew.weebly.com/uploads/1/3/1/3/131380356/1029480.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
    • http://dinuwulorixipe.epizy.com/diwexifesezevav.pdfIn PDF document text
    • http://gijuvove.epizy.com/finding_square_roots_and_cube_roots_worksheet.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_off0000e5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EE 5544 bytes
SHA-256: 28f67ff85c5b1055fd82a807624db860351e3ee79a98a90a711d85f4ec5f3fb6
font_01_sfnt_off0000f8bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BB 10672 bytes
SHA-256: e5c9ac5e92a760450f4e1a8099513fcfe828d30a5c006e90d3c6be98cbeaf4e6
font_02_sfnt_off00011d11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D11 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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