Malicious PDF — malware analysis report

Static analysis result for SHA-256 87a1ccc81f9fe22f…

MALICIOUS

PDF

76.2 KB Created: 2021-02-15 07:31:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 68b65a96fccd23fea3bd1abcc44b60c7 SHA-1: b71b303fcf009fb7371c29a95b1795c6e1730f52 SHA-256: 87a1ccc81f9fe22fb10fddd993dcdce74fdd0d7b099d817babc80a770e99726d
144 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains heuristics indicating it is a phishing lure, specifically designed to trick users into downloading software. The embedded URL and the document's content suggest a phishing attempt disguised as a software download. The ML classifier strongly flags this PDF as malicious, and ClamAV confirms this with a specific detection signature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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
  • 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://maypoin.ru/wix?keyword=prototype+2+apk+for+pc PDF link annotation
    • http://tiktoktop.design/oneplus_3t_aggiornamento_android_p72bqz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414498/normal_5fcd3076c8615.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370059/normal_5fd67cc60e393.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371814/normal_601d22fe8ecda.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475734/normal_5fc754efc577d.pdfIn PDF document text
    • https://cdn.sqhk.co/kewawukufiju/CjfhjxR/beyblade_burst_app_luinor_l4_qr_code.pdfIn PDF document text
    • http://korsabarca.com/17174502115t2ipr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421209/normal_6024469d0ed8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366957/normal_60129504b223f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410432/normal_6019645c6b141.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/ragetubakurowexaros.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/sejusunerubokaropimimaw.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/amos_23_full_version.pdfIn PDF document text
    • https://s3.amazonaws.com/bulujono/30069405814.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/bubosoxokevep.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_off0000eed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED2 5100 bytes
SHA-256: 08461e667927fce8bd5935fa7476b4c62a18b763c07498f063d484943e47a11e
font_01_sfnt_off00010051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10051 10424 bytes
SHA-256: 3492d4a46a4123a6c70a840ff72541d0f97a5bbf8e7cf48d95ed6a706c88ea63

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