Malicious PDF — malware analysis report

Static analysis result for SHA-256 c424bd447526a259…

MALICIOUS

PDF

77.6 KB Created: 2021-02-11 05:11:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6b6f284a5786082ba21676bdc34d2b24 SHA-1: d20851c9e056dd911b3496d2d1d286365138fc66 SHA-256: c424bd447526a25994ce4fe23e2fb2e95e6382e52492cc4550ada39a3c10996b
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://crophysi.ru/123?utm_term=scribblenauts+unlimited+apk+1.27'. This, combined with a heuristic indicating a visual download button, suggests the document is designed to trick users into clicking the link to download a malicious payload. The ML classifier also strongly flagged this PDF as malicious.

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?utm_term=scribblenauts+unlimited+apk+1.27 In PDF document text
    • http://trysoda.club/nuby_manual_breast_pump_videoq7268.pdfIn PDF document text
    • http://karnaval.host/case_files_anatomy_freeesvti.pdfIn PDF document text
    • https://cdn.sqhk.co/wazafepel/2hglQhe/27070551761.pdfIn PDF document text
    • http://coloradocustomelectric.com/algebra_2_pretestig6mw.pdfIn PDF document text
    • https://cdn.sqhk.co/pimidima/hhcijLy/tijurifagiki.pdfIn PDF document text
    • https://cdn.sqhk.co/xubulozirod/dtt0hbg/towaparasejovet.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/janodojivi/ycmou_ba_admission_form.pdfIn PDF document text
    • https://s3.amazonaws.com/gitipelut/angular_5_currency_format_input.pdfIn PDF document text
    • https://s3.amazonaws.com/bitizopovopaso/guitar_body_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/bas_bajna_chahiye_gaana_free.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/lucid_dreams_sheet_music_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/appium_multiple_android_devices.pdfIn PDF document text
    • https://s3.amazonaws.com/vetamedisoz/76762117252.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/86960012139.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/aov_server_vietnam_apk_terbaru.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_off0000e9e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E8 5824 bytes
SHA-256: 0b030c1ac3b0032d1c7bc8a6542e6432745d8a748e914efa30dd545e59d84f27
font_01_sfnt_off0000fdab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAB 13652 bytes
SHA-256: 985a3eeccc21d92bcf5d9f9feb55b52bf9a6e92dba6c62e54f9c6e54e32093b3

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