Malicious PDF — malware analysis report

Static analysis result for SHA-256 91ee880f8c577a86…

MALICIOUS

PDF

74.4 KB Created: 2021-03-09 19:57:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 49c0de72efde83449e1d49594c56183b SHA-1: 146b76817fb8f418af3fae2986455bf49591f7b3 SHA-256: 91ee880f8c577a86aca589a23280e9a8ae985d83edad4f944f166de8a6408e66
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing trojan. It contains a large number of external links, many of which are to PDF files, suggesting a link farm or redirection mechanism. The primary external URI, 'https://midufefew.ru/123?utm_term=ubuntu+server+32+bit+virtualbox', is likely intended to deceive the user into downloading a malicious payload by appearing to be a legitimate search result.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://midufefew.ru/123?utm_term=ubuntu+server+32+bit+virtualbox PDF link annotation
    • https://cdn.sqhk.co/jaguwubax/hfmchjW/fishing_life_vest_for_sale.pdfIn PDF document text
    • http://mixevome.22web.org/edu_science_reflector_telescope_525_power_manual.pdfIn PDF document text
    • https://rababavuve.weebly.com/uploads/1/3/1/8/131871532/nuzegen.pdfIn PDF document text
    • https://notowupoguja.weebly.com/uploads/1/3/5/3/135316513/nabebapu.pdfIn PDF document text
    • https://lujukote.weebly.com/uploads/1/3/2/7/132712447/da13a7a937.pdfIn PDF document text
    • https://cdn.sqhk.co/nusuguponu/947j5XY/dogiduluzebijutipurofeze.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/sigobija/7638211807.pdfIn PDF document text
    • http://kivekedifewu.rf.gd/kukepuwetukotuwuxibuwa.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/motetilewiwufekopujufap.pdfIn PDF document text
    • https://s3.amazonaws.com/vetamedisoz/59690531278.pdfIn PDF document text
    • http://fuzariwa.rf.gd/rupevusovakadijogaseje.pdfIn PDF document text
    • https://f459ab6e-ac57-43ce-b83a-1524846427e4.filesusr.com/ugd/938c70_6a24a91c0d194c43869ab54e073e6d70.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gimisorixosu/percent_solution_calculator_chemistry.pdfIn PDF document text
    • https://034618a9-9b39-4f41-ad18-95bca1d1c80b.filesusr.com/ugd/48d9a1_ea291e58cc5947e5bbffe0450ac76e8a.pdf?index=trueIn PDF document text
    • http://xojazexodiwosi.epizy.com/42748301392.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16e9b14f-96a7-4552-89b2-fd3cc18475a2/giruxonigotaxofukejalen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0d36927-6eb2-42ba-a20b-0459166cb0c8/the_wave_book_todd_strasser_sparknotes.pdfIn PDF document text
    • https://0df6220b-9630-4647-aab6-0d9db69b9d59.filesusr.com/ugd/8b97dd_51099e643c7d4c3daa3ce639168c4e44.pdf?index=trueIn 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_off0000e44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44D 5232 bytes
SHA-256: de1bc717a48749695f8033777ca8fc7190b7652fa3346c2feb478ba7159f1cb3
font_01_sfnt_off0000f633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF633 11056 bytes
SHA-256: 2982a3987c19d29d04e3dcfab147f3c99921f520bb40c2c26083e240096e7c8d

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