Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c0b45669658907a…

MALICIOUS

PDF

66.3 KB Created: 2021-02-23 19:42:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: cece1f26687c5acd9eaf1f31a029d360 SHA-1: 2434a5ce67bc2a7c06bf5a72280584d0d5cb4a2f SHA-256: 6c0b45669658907a9889fb2ccd54fa8024e709e56f57761ce08766b2a72c872b
184 Risk Score

Malware Insights

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

The PDF file contains embedded links that point to known malicious redirector infrastructure, specifically `https://crophysi.ru/strik?utm_term=libro+de+matematicas+6+ grado+contestado+2019`. The document body, though heavily obfuscated, suggests a lure related to educational materials. The presence of multiple links to disposable hosting and the ML classifier's high confidence score indicate a phishing or redirection attempt.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?utm_term=libro+de+matematicas+6+grado+contestado+2019 In PDF document text
    • http://kpovli.ru/7586346287675ofd.pdfIn PDF document text
    • https://cdn.sqhk.co/zatugudaxaji/1icific/kukazew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446260/normal_5fc85bcf4df5b.pdfIn PDF document text
    • https://pitazifuriza.weebly.com/uploads/1/3/0/9/130969431/6138625.pdfIn PDF document text
    • http://merishwheelrecords.com/beimaan_piya_re_dj_songaf84e.pdfIn PDF document text
    • http://weinmvc.net/25512786430hnqkk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384839/normal_5ff95b79c8bcb.pdfIn PDF document text
    • http://nekretnine.site/jusixiduwumifufogoken5e54o.pdfIn PDF document text
    • https://vavaxurose.weebly.com/uploads/1/3/0/7/130775274/e2c73351b6318b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sogaviwezed.rf.gd/boohoo_size_guide_s_m.pdfIn PDF document text
    • http://nadadeze.epizy.com/teacher_s_guide_math_10.pdfIn PDF document text
    • http://magufabag.rf.gd/retozagudikorowepexib.pdfIn PDF document text
    • http://turejop.rf.gd/think_and_grow_rich_movie_free_download.pdfIn PDF document text
    • http://jevopuvejamiv.epizy.com/leliwarewapidodoxenogu.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_off0000c125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC125 5944 bytes
SHA-256: 1f38e46e564067f08bc4bfe1bbfbdd62e6230fc75c005f024a670195fe904c1f
font_01_sfnt_off0000d546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD546 11516 bytes
SHA-256: 5187afb35ca878248bbea1a52264207563c237a53246ccabb5ba79fd5492f232

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