Malicious PDF — malware analysis report

Static analysis result for SHA-256 d08a9b23171bd9ba…

MALICIOUS

PDF

633.9 KB Created: 2021-03-10 13:06:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 6253be203b25940d9e33fcd7b87b06d8 SHA-1: 06f764839e25234cec97f2b6dbf707f6e28cfc19 SHA-256: d08a9b23171bd9baa094275eb5469ae6ca77930abfc3db53ace02af8a7907553
154 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and it contains a critical heuristic firing for a PDF redirector link pointing to a known malicious URL. The embedded URLs suggest an attempt to direct the user to malicious content, likely for phishing or to download further malware. No scripts were extracted, but the presence of malicious links is sufficient evidence of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8325

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://crophysi.ru/award?keyword=bel+ami+carte+pdf In PDF document text
    • http://invitesistem.ru/what_to_do_with_a_masters_in_physiologymxmxo.pdfIn PDF document text
    • https://cdn.sqhk.co/livukigelo/bggjijh/60053252998.pdfIn PDF document text
    • https://cdn.sqhk.co/denepepunuja/ghGpheq/59794619844.pdfIn PDF document text
    • http://wivaserana.mywebcommunity.org/html_css_editor_for_android.pdfIn PDF document text
    • http://wamuwosola.mygamesonline.org/python_3.4_tutorial_for_beginners.pdfIn PDF document text
    • http://rivalo130.com/69729679188zvcj2.pdfIn PDF document text
    • http://1offpark.xyz/xurosuzapupowofix8v0dk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377706/normal_603a268a56492.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421207/normal_5ff3e94d22109.pdfIn PDF document text
    • http://rodina38.ru/blender_eevee_contact_shadowsi4hwh.pdfIn PDF document text
    • https://cdn.sqhk.co/lawipavoso/fdIxTsm/werabofu.pdfIn PDF document text
    • https://cdn.sqhk.co/wevexifimur/YDhdfqb/top_100_mobile_games_2020.pdfIn PDF document text
    • http://walletelectrum.buzz/11909978257qwzb6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/486007ea-0ac4-477b-a003-826effa269d2/cost_management_accounting_course_duration.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21f6b4aa-28fb-490b-9471-ddd9355d37d8/what_is_the_tv_code_for_dynex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f31b8fa-17ac-402c-90f5-046a2e7e5c8a/16936676865.pdfIn PDF document text
    • https://s3.amazonaws.com/wesezuzuvalirik/blotting_sheets_for_hair.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bede11c3-52a7-4f48-8122-e6f14af7d9f4/lolizowamixobo.pdfIn PDF document text
    • https://s3.amazonaws.com/palevijuj/siwusuliva.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_off0009a2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A2FA 5172 bytes
SHA-256: 03c40979c74f7190e84a0d44a8fe458376c6ed1345393f3443d2ea69d5aafc82
font_01_sfnt_off0009b47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B47C 10372 bytes
SHA-256: 42e4fdaa21bf97990870aa0c81376703093106a4498a6c6bd143d4a46aa7f21b

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