Malicious PDF — malware analysis report

Static analysis result for SHA-256 c263f4e42acdc912…

MALICIOUS

PDF

81.3 KB Created: 2021-03-18 22:52:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e99d3c87c7ee2fc73cc139d05023e552 SHA-1: 7c176a712f0712fc58ebcad6ad81b5331734607e SHA-256: c263f4e42acdc91258476eb34b00fa65aae1a250fbf3ef04d5d07bc402a6011a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/wix?keyword=geometry+midterm+exam+answers+2018
    • http://shopee24.site/90830982987d6b8w.pdf
    • http://vudifabofugejij.medianewsonline.com/jovowatonezi.pdf
    • http://operationhomeplate.com/arcsoft_totalmedia_showbiz_3.5_manualjib6f.pdf
    • http://xasanefajisa.sportsontheweb.net/52462071103.pdf
    • http://nitesufi.sportsontheweb.net/fofitakadikuvobitopop.pdf
    • http://texoraw.sportsontheweb.net/zukubejawefitijetovogup.pdf
    • http://zolepop.mypressonline.com/74506291183.pdf
    • http://xelasurugopu.mywebcommunity.org/zegibakufasa.pdf
    • http://nosumiva.mywebcommunity.org/exercice_corrig_atomistique.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zijivevip/cancer_care_informatics_jordan.pdf
    • https://s3.amazonaws.com/lazolu/40084390168.pdf
    • https://s3.amazonaws.com/medaliwifufugel/poxiwesomovilo.pdf
    • http://boxijekew.atwebpages.com/kadambari_books_in_marathi.pdf
    • https://s3.amazonaws.com/devuxuzejozam/sociology_of_religion_malcolm_hamilton.pdf
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_39b1f8334eb84f74886bfc37281b8274.pdf?index=true
    • http://nafaradevofipaf.myartsonline.com/libros_de_harry_potter_en_espaol_para_leer.pdf
    • https://uploads.strikinglycdn.com/files/586e7cb2-10ac-4ef9-9d19-b7737c62c25f/how_to_remove_acne_scars_from_back_naturally.pdf
    • https://ef5e9b3f-1a8e-4c79-9b60-34b8f8133c96.filesusr.com/ugd/18574e_581316b6ef1f4bf9a0a9f68ef0024d18.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0a51145d-7f42-4b44-88df-4aba2c3b1ce4/13035323405.pdf
    • https://uploads.strikinglycdn.com/files/557fa044-8dd6-4027-9e5d-891cc569b9ed/daverixime.pdf
    • https://s3.amazonaws.com/kozibowisenatu/novijimaf.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f71e.bin
bd4b7c0ec7c5e8a4d6b6470e00f10218d76b9a930a17b8102a295156d7fcc3f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF71E 5752 bytes
font_01_sfnt_off00010abc.bin
fe38572b2606b88a2ec77399a422bc119fd96e2e31cd7dd38bb92f9232528b03		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABC 14000 bytes

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