Malicious PDF — malware analysis report

Static analysis result for SHA-256 c05a695f7917db3a…

MALICIOUS

PDF

65.2 KB Created: 2021-02-19 12:44:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 731017223ffbc3446c8df9dde7f87286 SHA-1: 89651610de3975e0a28d794d2119a38476e9b58e SHA-256: c05a695f7917db3a62e80308df8365943c8011fb2510617a1e0f05eb05c14535
154 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for a link to known malicious redirector infrastructure. The embedded URL `https://crophysi.ru/wix?keyword=computer+hardware+matching+worksheet` strongly suggests a phishing attempt to lure users to a malicious site. While no scripts were explicitly extracted, the PDF structure and the presence of numerous suspicious URLs indicate a likely attempt to deliver a malicious payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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/wix?keyword=computer+hardware+matching+worksheet In PDF document text
    • https://cdn.sqhk.co/feduvefas/NxjesAM/u_mobile_apk_old_version.pdfIn PDF document text
    • https://cdn.sqhk.co/naludibeg/xijigVv/levefiwufagorodiduv.pdfIn PDF document text
    • http://smallita.space/family_game_night_flyer_template_free7biq8.pdfIn PDF document text
    • https://cdn.sqhk.co/kopilixa/cPhaKdv/ares_virus_game_guardian.pdfIn PDF document text
    • https://cdn.sqhk.co/tajixixejafi/jf5Noje/gunnar_optiks_intercept.pdfIn PDF document text
    • https://cdn.sqhk.co/zaliroded/jhylWrp/duvozizavimalu.pdfIn PDF document text
    • https://cdn.sqhk.co/bikegola/gg5gjhj/wowojexobosukefogojibeke.pdfIn PDF document text
    • https://cdn.sqhk.co/foropogajag/aBjdtS8/kifediposedanude.pdfIn PDF document text
    • https://cdn.sqhk.co/nilesatu/lheggiq/13824815758.pdfIn PDF document text
    • https://cdn.sqhk.co/pefevepufi/hgOQNji/zolezizu.pdfIn PDF document text
    • https://cdn.sqhk.co/gulaxemetila/gejauMw/score_hero_hack_2019_ios.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/fadadedezeker/latin_america_map_worksheet.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_off0000c28b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC28B 5516 bytes
SHA-256: 295ff5cffe3bbae407f860b618c08a0f02c60e65998eb3f011d5e481adb85adb
font_01_sfnt_off0000d52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52E 10316 bytes
SHA-256: 03bbeecdf4e8191e6fd2c2033b60ad88b2ed085881c270d55e3823c66ea12c3e

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