Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9f362e38da6b936…

MALICIOUS

PDF

77.9 KB Created: 2021-03-24 21:01:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 3ca7377f8d10c866c3bdd7b817d8ba6f SHA-1: d2c60dfcbab836777765865c9251dcd63e9bba59 SHA-256: a9f362e38da6b936c7f60e465b284885beaa012920f64b0c4364316c0ed9a8e5
96 Risk Score

Malware Insights

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

The PDF contains an embedded URL that directs users to a site impersonating a college board practice test answer key, a common phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a phishing page or a secondary payload. No scripts were extracted, but the PDF structure and embedded URI are sufficient indicators of a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://midufefew.ru/123?utm_term=college+board+practice+test+3+answer+key PDF link annotation
    • http://xakidofe.sportsontheweb.net/33717443010.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368466/normal_5fdc197d25123.pdfIn PDF document text
    • https://cdn.sqhk.co/togixulala/cjcAgfm/ccitt_mu-_law_format.pdfIn PDF document text
    • https://cdn.sqhk.co/befozaxulot/IghjjbN/45578181749.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370985/normal_6031af5007858.pdfIn PDF document text
    • https://cdn.sqhk.co/juxezijafoz/2gehije/29245278556.pdfIn PDF document text
    • http://figimumagoko.mygamesonline.org/nosukiromusirimawot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402250/normal_6059d7593c81d.pdfIn PDF document text
    • http://suvekitubexeso.getenjoyment.net/luruvupipapeziwikomab.pdfIn PDF document text
    • http://fitatuvepejozo.sportsontheweb.net/malayalam_bible_quiz_free_download.pdfIn PDF document text
    • http://nedavupagisezim.mygamesonline.org/35725978881.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463825/normal_5fd81a98dcb2f.pdfIn PDF document text
    • https://cdn.sqhk.co/gupimupiset/hjdn5jj/70304867453.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kugajevekafino.myartsonline.com/cuaderno_de_investigacion_en_psicologia_social.pdfIn PDF document text
    • https://s3.amazonaws.com/kaxukok/email_template_for_conference_invitation.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/92619165675.pdfIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/bapabedonobulevifegusiwi.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/class_12_chemistry_book_ncert.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/36858726675.pdfIn PDF document text
    • http://vavadot.onlinewebshop.net/80519081475.pdfIn PDF document text
    • https://s3.amazonaws.com/kotenu/around_the_world_in_80_days_2004_watch_online_free.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_off0000f087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF087 5708 bytes
SHA-256: 7559926215591e82ac4b9ff4210cc0a0e727d9cbf86dca1f645b094f5b2fd856
font_01_sfnt_off00010416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10416 10768 bytes
SHA-256: 5238e96fb38ba40a373dc3ca544c1c9075aeb6d1fd1fe092d177fa284cdcc860

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