Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ba92c747645bb0c…

MALICIOUS

PDF

70.4 KB Created: 2021-02-17 05:24:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: d23fce4be062935e2061cfc605491b12 SHA-1: 461c547d902340313c164dda54cefebab0649fde SHA-256: 5ba92c747645bb0c728ae003ac12d504c3b80e4d4e1cf19e2bdcc7c35e7a863b
162 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://crophysi.ru/wix?keyword=12+disciples+ks1+worksheet'. This URL is likely used to host a phishing page or download a second-stage payload. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the nature of the redirector suggests an attempt to trick the user into further interaction, aligning with phishing or malware delivery tactics.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=12+disciples+ks1+worksheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4470220/normal_600db8a6f0087.pdfIn PDF document text
    • https://fosijegaden.weebly.com/uploads/1/3/4/8/134868146/1a25e2.pdfIn PDF document text
    • http://buzosidatiwe.iblogger.org/chinese_numbers_worksheet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384483/normal_5fdeed88df29c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408188/normal_5fd7c1c6cc0db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403428/normal_601546a036c6e.pdfIn PDF document text
    • https://pusenosate.weebly.com/uploads/1/3/5/3/135347115/bubofinud.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385847/normal_5fe3f1a764486.pdfIn PDF document text
    • http://zozuwax.66ghz.com/88069340669.pdfIn PDF document text
    • https://nukoxola.weebly.com/uploads/1/3/1/3/131380146/5040187.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485943/normal_5fdd880a452f5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xikisefux.epizy.com/lp_abortus_inkomplit.pdfIn PDF document text
    • https://s3.amazonaws.com/lawakux/hypogonadism_guidelines_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/jeduzizonox/inverse_functions_examples_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/polexebuj/81333119778.pdfIn PDF document text
    • http://bavipilebevim.epizy.com/android_21_sh_figuarts_release_date.pdfIn PDF document text
    • http://vajexakatozezal.epizy.com/alberta_salvage_vehicle_inspection_report.pdfIn PDF document text
    • https://s3.amazonaws.com/bisazabe/73540564403.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_off0000d74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74E 5196 bytes
SHA-256: 6da262101bdca47d5cfc31b3b3036f079b073a3112f7b86f5571ee456c55b8a2
font_01_sfnt_off0000e914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE914 10336 bytes
SHA-256: f29916ecdeed6eee1e0d6a18c98dd569d38f5b363c5ef8645ca11ab537c270ab

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