Malicious PDF — malware analysis report

Static analysis result for SHA-256 71b1bcc57c9ebf7b…

MALICIOUS

PDF

74.3 KB Created: 2021-02-21 07:11:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 93b7cfdd45bddf2068899d2b015dff57 SHA-1: b19fee36f4505b8a09140a42033ddb3aefccba8b SHA-256: 71b1bcc57c9ebf7bca8fd361c120e9e5f25984803fe91255f04089c7a790bc4a
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded URL suggest it's designed to trick users into visiting a malicious site, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://yafferge.ru/123?utm_term=what+lawn+mower+is+best+for+uneven+ground In PDF document text
    • https://static.s123-cdn-static.com/uploads/4485800/normal_5fdd5b2fd6157.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380382/normal_5fe901432db46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446380/normal_5fd3d780701ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393179/normal_5fea42ab4eebf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489599/normal_6031c8562c1db.pdfIn PDF document text
    • https://cdn.sqhk.co/sedazozesufu/jjGhdid/control_center_ios_13_screen_recorder.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458618/normal_5feed27fd849c.pdfIn PDF document text
    • https://cdn.sqhk.co/vizelupavew/iJicjil/new_latest_best_islamic_ringtones.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465264/normal_601872677547e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411220/normal_602019f74e578.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501193/normal_600fad12917c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476596/normal_601b50487bf31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409998/normal_6031dec9cdc89.pdfIn PDF document text
    • https://cdn.sqhk.co/pevedapev/dfjbygc/red_sunset_maple_vs_october_glory.pdfIn PDF document text
    • https://cdn.sqhk.co/widiroje/ZYjgCY0/osm_scoutlist_2018_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/jozazixefuf/djOheqE/rogupetasetosolugizito.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_off0000e6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F7 5628 bytes
SHA-256: 6a0d00f89c174de3ac08be9729af963229eae9b9798810bbfcc90e0ae5e9fc9d
font_01_sfnt_off0000fa08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA08 9824 bytes
SHA-256: fbe92a55cb67e4301571523e974dd23c739c77f03e82212678c57375df8e1f25

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