Malicious PDF — malware analysis report

Static analysis result for SHA-256 5efa62667a56d5f3…

MALICIOUS

PDF

75.8 KB Created: 2021-03-19 06:06:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 16c85c1e52b06bf848c5329c9118f58f SHA-1: df96a7b8c2487a6fc6acf51bfbc09869452d9e4f SHA-256: 5efa62667a56d5f36a0ccf3a8fe27f9ce80e9f2f506891a2456aaa02575fd634
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains heuristics indicating it's a phishing lure, specifically using an 'Android Google Play location' theme to entice users. It redirects to a suspicious URL, 'https://midufefew.ru/123?utm_term=android+google+play++location', which is a strong indicator of malicious intent. The ClamAV detection and ML classifier further confirm its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/123?utm_term=android+google+play++location PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4423454/normal_60078c52dc36c.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/D8ifij3/27208998277.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412761/normal_5ff0286ee12cc.pdfIn PDF document text
    • https://cdn.sqhk.co/menaleratupo/E7N4jif/46708389913.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489839/normal_5fe63bd1e459e.pdfIn PDF document text
    • https://cdn.sqhk.co/pasepizut/igigfhb/cube_survival_story_mod_apk_1._0._31.pdfIn PDF document text
    • http://clubstore.info/database_management_definitionowx7a.pdfIn PDF document text
    • http://stroiline74.ru/what_is_news_all_about7ks1n.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386618/normal_5fe4211627aee.pdfIn PDF document text
    • http://br1.red/xupuwefujil1mix8.pdfIn PDF document text
    • http://antonioit.fun/law_of_torts_noteswtpqa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488349/normal_6005f7668510a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370740/normal_5fecd5be8134f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379849/normal_602b2d115040d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://46ebecaa-9490-439b-bba6-ee77f1a6ca93.filesusr.com/ugd/cee8a1_c5c1d277da624ff9b6a16c729cf579f4.pdf?index=trueIn PDF document text
    • http://felepukagerek.epizy.com/44823763855.pdfIn PDF document text
    • https://f8206d31-21c4-4aef-9da9-e4259ded718a.filesusr.com/ugd/c2bdac_3441d54ee0ec4032bfc19a812bbcc199.pdf?index=trueIn PDF document text
    • http://donarup.rf.gd/neoliberalismo_significado.pdfIn PDF document text
    • https://9849c7ec-8b19-4b81-9a64-db2537ea7c40.filesusr.com/ugd/97b1c0_9158a41216994bfea6e18a5c8f156b78.pdf?index=trueIn PDF document text
    • https://0a37a3d5-a0bf-4e77-8ff5-6127fd08aefa.filesusr.com/ugd/6046c9_34d514a4ea824f81806c68e83e3bbe3b.pdf?index=trueIn PDF document text
    • https://492f55f4-3442-4b37-b17e-39d9f2f0ae8a.filesusr.com/ugd/7dfe85_704e75e256bd441d89d7ae2850a8c2fc.pdf?index=trueIn 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_off0000ec3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3F 5156 bytes
SHA-256: e8bf27f66a09291d1b8ac3cd8a05f05d469acb05000f4970bc4a0850c970a8fc
font_01_sfnt_off0000fde2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE2 10564 bytes
SHA-256: 2b67e65d8281cd6c3658b1747bf264b9d5e64e6cb113f16753f740f08b5189d1

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