Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccfecd1c6f9bea39…

MALICIOUS

PDF

75.5 KB Created: 2021-02-20 03:38:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: c97cfcc46cbac56d31aac7f3c7fe90a6 SHA-1: 43b3f975acef523221a00a68e9e4f63f5f85cbff SHA-256: ccfecd1c6f9bea39067a67689d85eb5bc3717f976a0289cde3f2c7ebdbafe9cf
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 'crophysi.ru'. This indicates the document's primary purpose is to lure users to a potentially malicious website. The ML classifier and ClamAV detection further confirm its malicious nature. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the redirector suggest an attempt to download or redirect to a second-stage payload, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=the+power+of+thinking+big+free+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4392853/normal_5fdc4ee8230be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474478/normal_5fd1708f02fdb.pdfIn PDF document text
    • http://bred-enligne.com/tonipugopefenilaseziyfmn1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411219/normal_5ff6592300469.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375203/normal_5fd3b51833001.pdfIn PDF document text
    • https://cdn.sqhk.co/satidaruxami/jahi9B8/brahma_chicken_height.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403260/normal_5fe3eb9703066.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369779/normal_5feb289467a73.pdfIn PDF document text
    • http://ewwe.space/pokemon_unblocked_games_weeblym5ztf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365602/normal_600735ce14dd0.pdfIn PDF document text
    • http://trells.space/sbl_examiner_report_september_2018o2gqj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491670/normal_6004529cb1bb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413866/normal_5fe623c156b30.pdfIn PDF document text
    • http://kersita.fun/jufegu4h7rl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495843/normal_5ff2643ed1d47.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463560/normal_5ff08f275e9d7.pdfIn PDF document text
    • http://weinmvc.net/71454060240fh62c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498376/normal_5ff64d3b9d91d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4506200/normal_60147ced94cfa.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_off0000eb8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8C 5128 bytes
SHA-256: 24dcd92d3f6f3ae31869f33a96096a8aee3d1ea69da41816cf418f084f2b6b28
font_01_sfnt_off0000fd0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0B 10328 bytes
SHA-256: 1a62bb01eb3d62e70ae1032c8c94be29ab2b77b67047e6da6cd6447127295da1

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