Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae3f6c65d8392f0c…

MALICIOUS

PDF

65.3 KB Created: 2021-02-21 07:32:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7e8da77e0aac4ed6ae2c314988291024 SHA-1: 22252c11ef53aa18e04b5af9c4b866d59e8575be SHA-256: ae3f6c65d8392f0ca1a30bee9b92e12d5264181a973502511058eafe71c780bc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous embedded links, flagged as a 'PDF_SEO_LINK_FARM', suggesting a tactic to generate traffic or distribute malware. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of external URIs, including one pointing to a PDF file on 'maslovauto.ru', further supports the conclusion that this document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
  • 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/wb?keyword=lexus%20rx%20350%20f%20sport%20price%202020 PDF link annotation
    • http://maslovauto.ru/tesugakegusavejumebiwukupg1.pdfIn PDF document text
    • https://tewizoduwab.weebly.com/uploads/1/3/5/3/135341898/ropitazor.pdfIn PDF document text
    • https://nokejulaju.weebly.com/uploads/1/3/4/6/134696540/1992003.pdfIn PDF document text
    • http://winoorama.space/25414976158bohav.pdfIn PDF document text
    • http://aicberg.net/air_fighter_airplane_shooting_mod_apkfxx6y.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/gowupuzokowuxes/fugekixamonewelisemep.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/jolipew.pdfIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/sad_violin_music_meme_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/sojuravewi/68501152289.pdfIn PDF document text
    • http://pimorem.epizy.com/753172411.pdfIn PDF document text
    • https://s3.amazonaws.com/fadadedezeker/xaxiwegavikuna.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_off0000c2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2FC 5340 bytes
SHA-256: a53c187e9106fee69410e91474775e69996899436b8469f41dc28f24ff274b66
font_01_sfnt_off0000d54b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54B 10508 bytes
SHA-256: 25566ecbe26664426c407a93c9baa21de8420c7ead99c5cc887954457eb4a70e

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