Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c51f0df52169f4e…

MALICIOUS

PDF

178.6 KB Created: 2021-05-02 22:16:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: acbc760afe8ccde20b05c0a6f3a8fc77 SHA-1: 90bd5fb055f9946aabbd5187f9b1f767053193a9 SHA-256: 4c51f0df52169f4ee42fd5e2811b6aa40f61d885e3d8fcfbcbb0d6e1af6a258f
96 Risk Score

Malware Insights

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

The PDF contains an embedded URL that, when visited, likely leads to the download of a malicious payload disguised as a Subaru Forester repair manual. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple unknown and potentially malicious URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://jacksth.ru/strik?utm_term=2011+subaru+forester+repair+manual+free+download
    • http://tifusavegapawuf.mygamesonline.org/pemovuludupinipuj.pdf
    • https://guzepebizosi.weebly.com/uploads/1/3/4/8/134880367/0d982a0dd.pdf
    • https://nevipezuke.weebly.com/uploads/1/3/4/6/134652321/408265a4750db.pdf
    • https://mebijanuwirat.weebly.com/uploads/1/3/4/0/134042853/b2d5beb.pdf
    • http://lologunaw.mygamesonline.org/business_model_en_franais.pdf
    • http://lixebafevoku.mypressonline.com/bukhari_sharif.pdf
    • https://xexifenenufomag.weebly.com/uploads/1/3/6/0/136082553/8804492.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/minaxigevani/wibeterobamavidomev.pdf
    • https://uploads.strikinglycdn.com/files/fe09f21d-e67a-4fdc-a4f2-bec88a131d43/kozuwevogoferopilisi.pdf
    • https://s3.amazonaws.com/napejaxosinages/31133461210.pdf
    • http://kizufalugomux.atwebpages.com/learn_english_speaking_download.pdf
    • https://s3.amazonaws.com/bodajaku/when_to_plant_native_grass_seed_in_texas.pdf
    • http://wuwedilejom.myartsonline.com/personal_branding.pdf
    • https://s3.amazonaws.com/jefazaxal/revolution_slider_video_background_template.pdf
    • https://s3.amazonaws.com/popilo/bovov.pdf
    • https://s3.amazonaws.com/dibedamoka/heart_of_darkness_a_filmmakers_apocalypse_watch_online.pdf
    • https://uploads.strikinglycdn.com/files/1aa9828b-4bf7-44d4-83b6-a336eb62930f/jigato.pdf
    • https://uploads.strikinglycdn.com/files/1c143c9c-74dd-48e8-86e1-e3d4b4c73aa2/4049980441.pdf
    • https://s3.amazonaws.com/boduxatavepe/free_admin_templates_html5_css3.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_off00027f3e.bin
1e6f89b2ba9e2e1340e96be010e26587d05c5f741a4a607918065d8e976f46a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x27F3E 5652 bytes
font_01_sfnt_off0002926b.bin
6e8d4cc35493014edb224a9c8231e377f3071c5374723fc2964ae408611a995a
pdf-font-stream PDF embedded font (sfnt) at offset 0x2926B 12256 bytes