Malicious PDF — malware analysis report

Static analysis result for SHA-256 495091bb116e34c1…

MALICIOUS

PDF

84.8 KB Created: 2021-03-29 19:26:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a77f6fc0013c08a5ffb0ffccce43e575 SHA-1: bcfb24a9eb0a432f43fc8adcd8ef15053b6575ea SHA-256: 495091bb116e34c1ec0652a4838032531fdbee9334b2400c70f97d9eee67be4a
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains heuristics indicating it is a phishing lure, specifically using an SEO redirector to disguise a download link. The embedded URL 'https://leonvi.ru/wix?keyword=mortal+kombat+apk+ios' is flagged as a high-risk indicator for this type of attack. While no scripts were explicitly extracted, the nature of the PDF and the detected heuristics strongly suggest a phishing attempt designed to trick users into downloading malware.

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
  • 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://leonvi.ru/wix?keyword=mortal+kombat+apk+ios PDF link annotation
    • https://cdn.sqhk.co/kanemili/hbgja2A/sofa_set_for_sale_gumtree.pdfIn PDF document text
    • https://cdn.sqhk.co/difixoruze/2jajjjP/1602751792.pdfIn PDF document text
    • https://cdn.sqhk.co/pesasotiro/gihj89J/barber_shops_chicago_open.pdfIn PDF document text
    • http://tilikef.mygamesonline.org/xutuvonovo.pdfIn PDF document text
    • https://cdn.sqhk.co/mokevesin/ificjbl/76809724005.pdfIn PDF document text
    • http://bivaxosufuxibo.mygamesonline.org/53107480931.pdfIn PDF document text
    • https://cdn.sqhk.co/pudibamune/ggeFWnw/gta_v_ambient_occlusion_performance.pdfIn PDF document text
    • http://napufokotipo.getenjoyment.net/can_a_trustee_buy_property_from_the_trust.pdfIn PDF document text
    • http://pofuxubilet.sportsontheweb.net/65605224204.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/muvazi/xumufuvibobepukejopekidul.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/frog_dissection_lab_report_introduction.pdfIn PDF document text
    • http://viniwowosur.onlinewebshop.net/mastering_blockchain_2nd_edition_free_download.pdfIn PDF document text
    • https://0f8fedcd-12c0-4678-86f8-e2bff7269121.filesusr.com/ugd/70e7d4_881ba84a227f4141a4b4c1f9af1fb862.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/23604be9-de71-4f14-9a14-32e02a054f0e/how_to_find_the_angles_of_a_isosceles_triangle.pdfIn PDF document text
    • https://s3.amazonaws.com/vebogotexaf/dibug.pdfIn PDF document text
    • https://s3.amazonaws.com/sejakopa/7178411847.pdfIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/debana.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/65838427555.pdfIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/lewenokovadudusinofel.pdfIn PDF document text
    • https://f84ffea9-2755-49c2-9cb5-47ca8b55fe65.filesusr.com/ugd/0adedf_66adfb4ab66644d9910927486d35add0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/57357366-ef57-4530-bbe1-89c12f11412c/legasa.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f01e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01E 5176 bytes
SHA-256: 2f5a718bfd6f2efdb2d93dca54e7303fb328b79264b1b604d0f2eb6940f29a1e
font_01_sfnt_off000101a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A3 10980 bytes
SHA-256: d0c38259786c2a3baebf6926de7270d7a83ba15dbe2b1a3d0a1864f5e19692d0
font_02_sfnt_off00012760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12760 18476 bytes
SHA-256: c388ea0bb24448bd96babcdc2ea571c43d04b63ae48b1bd2d995edf24bbc8859

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