Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcee7ef1936cdc4c…

MALICIOUS

PDF

69.9 KB Created: 2021-02-12 14:20:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 967b1a80e29ffcce2ccf42766c608be6 SHA-1: 2d8c22c6e8fa780a1eda1cf139551ed0a4dd29c3 SHA-256: bcee7ef1936cdc4c834fd00f7c5bfb55aa148852c0d9b5f42333e6c0c9a48980
154 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://yafferge.ru/123?utm_term=que+es+un+proceso+tecnico+administrativo'. ClamAV also detected the file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0'. The ML classifier strongly flagged this PDF as malicious. The document body is heavily obfuscated and unreadable, but the presence of a malicious URL is sufficient evidence of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://yafferge.ru/123?utm_term=que+es+un+proceso+tecnico+administrativo In PDF document text
    • https://cdn.sqhk.co/vakanaju/c69hhgf/business_startup_ideas.pdfIn PDF document text
    • https://cdn.sqhk.co/rejibebadit/hhjghjb/car_driving_4_hard_parking_mod_apk_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453540/normal_5fc8a8b5ccc5b.pdfIn PDF document text
    • https://cdn.sqhk.co/lidupusumoj/hi0hejh/71176747821.pdfIn PDF document text
    • https://cdn.sqhk.co/tevenijubuso/eGDjiia/pottery_wheel_throwing_class_near_me.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480585/normal_5fdc9ce287668.pdfIn PDF document text
    • http://nesobaka9.xyz/ursa_mini_pro_user_manualtagg9.pdfIn PDF document text
    • http://hamlikjorettoop.ru/uso_del_vernier_pptsvoaq.pdfIn PDF document text
    • https://cdn.sqhk.co/dowusutitozi/hIhjxHG/anger_of_stick_1_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/laxefotogulo/jb8hi5f/lebanese_warak_enab_calories.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419211/normal_5fcd61a43ea2b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416331/normal_5fc75663292e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409413/normal_5fd8535a38f1f.pdfIn PDF document text
    • https://cdn.sqhk.co/fevivesuxofo/egioijt/buffalo_wings_and_rings_jasper_phone_number.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/zerejibixupav/avid_media_composer_8._5_mac.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_off0000d237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD237 5308 bytes
SHA-256: 34f0215baaad9edff0083c43ff07591f9b225d5fbfa5f4d992b5b53f143c5cb7
font_01_sfnt_off0000e432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE432 11388 bytes
SHA-256: 90c6aa477265ed1b7dd1029fd82b8a1230c3ffecc7ed269efece09a7bbcff17c

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