Malicious PDF — malware analysis report

Static analysis result for SHA-256 9760b0b1ae0af145…

MALICIOUS

PDF

64.0 KB Created: 2021-02-22 17:41:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 030fe72f8e859e679b2d75a688cda7c3 SHA-1: 57c7041d141c396aca57c41ad9320048b4fbc81f SHA-256: 9760b0b1ae0af145d3aeffc6a2e979f8dd78be1418409bdf170dd8b4ff054839
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, https://crophysi.ru/wb?keyword=don't%20let%20me%20be%20lonely%20claudia%20rankine%20ebook, which is indicative of a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. The embedded URL and the document body suggest a lure to download an ebook, which is a common tactic for distributing malware.

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://crophysi.ru/wb?keyword=don In PDF document text
    • http://japancar-sib.ru/strategic_management_concepts_competitiveness_and_globalization54zq4.pdfIn PDF document text
    • http://groby-ritual.online/xidifamasiwigwlehx.pdfIn PDF document text
    • http://micrometerdigital.xyz/44736314006q1z4r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490961/normal_5fdbe94905cf7.pdfIn PDF document text
    • https://cdn.sqhk.co/zaviresodew/chgxfid/4_pics_1_word_8_letters_red_carpet.pdfIn PDF document text
    • https://cdn.sqhk.co/tibakekavero/iiNUVDN/mini_legends_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367633/normal_60137f6f0e826.pdfIn PDF document text
    • http://roflan.site/leperazoxibelabupugiwowofchsy.pdfIn PDF document text
    • https://cdn.sqhk.co/pojimisuso/ieChgj5/arihant_sample_paper_class_10_english_solutions.pdfIn PDF document text
    • http://shoop-fk.ru/vebusowinoxejobimosa11v.pdfIn PDF document text
    • http://trokot-new.online/caia_level_2z9jpu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392193/normal_5ff4801ee3cc2.pdfIn PDF document text
    • https://cdn.sqhk.co/jojojidatun/LjiLcDG/lasaxejolulubipasireju.pdfIn PDF document text
    • http://want-seo.ru/40870288110parx1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367914/normal_5fcff3e8c8d45.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000bfc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC0 5248 bytes
SHA-256: 6f321b345004929ab65c306f2fa1e4f768fab22bbb19035cdcea911c3c2fef65
font_01_sfnt_off0000d190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD190 9808 bytes
SHA-256: ec9bca5ac45c4cdc0a3256f4d6f08f42154cfc68d5ee99656e4fa2fec7a06683

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