Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b9d24c064acdced…

MALICIOUS

PDF

71.7 KB Created: 2021-02-16 23:49:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 4ae8897127dd6369eee9de34acf18006 SHA-1: d19a7f19aa8372afadc103b8a9ae01d28b4ba6f7 SHA-256: 7b9d24c064acdced5806c93ae446a7357cfa70f8123e479504eab761dfbbe05a
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI and an image lure that redirects to the URL https://jacksth.ru/wix?keyword=star+sports+live+cricket+streaming+bangladesh+vs+afghanistan, indicating a phishing or credential harvesting attempt. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://jacksth.ru/wix?keyword=star+sports+live+cricket+streaming+bangladesh+vs+afghanistan PDF link annotation
    • http://reguburobijoda.22web.org/bootloader_linux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402250/normal_600df7d8763a5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455207/normal_5fed13f5bdafc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446273/normal_602645cadbd85.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468563/normal_5fc7d2721b022.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459784/normal_5fe5194b203e6.pdfIn PDF document text
    • http://damodudajipofem.22web.org/50030468396.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490528/normal_5fe59e9a1b42d.pdfIn PDF document text
    • http://jubigorut.iblogger.org/poruxuxesejedeloworelat.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372673/normal_6005078c6fd24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366055/normal_602b2a9911bf6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452171/normal_5ffe439770804.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496582/normal_5fcdacc2b3d9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486772/normal_5fdb35b06b039.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://buxozowiliva.rf.gd/clarisonic_mia_smart_user_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/55941023706.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_off0000d9e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E3 5936 bytes
SHA-256: e17cd1b4e68714ae87644193fdc03238f40ce5472fc91b5126f7ca86ee0cd9ea
font_01_sfnt_off0000edef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEF 10420 bytes
SHA-256: 62c4478e1e73ea8932249d6933daecaed3a95b95dd74e8f6f2114c0499d50684

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