Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad51fbbf30cee704…

MALICIOUS

PDF

79.1 KB Created: 2021-03-10 10:48:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 90b696a07542f7b00260eda8364e2045 SHA-1: 9a2f2c5860c927bab146bc6a3cfbda08b26d2776 SHA-256: ad51fbbf30cee704866f7d72c3568e852e6e35309cbdee45b231803f67b36775
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://kuzutuzo.ru/wix?keyword=pmea+district+2+chorus PDF link annotation
    • http://xuxijosut.sportsontheweb.net/a_behavioral_theory_of_the_firm_1963.pdfIn PDF document text
    • http://mosuxuvemuzuwex.mywebcommunity.org/how_long_to_learn_forklift.pdfIn PDF document text
    • https://cdn.sqhk.co/genopeno/UhfuThg/batajujafava.pdfIn PDF document text
    • https://cdn.sqhk.co/zubavagi/Dm9icig/vesegipemiruxexekevemotoz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490365/normal_5ff9075cac766.pdfIn PDF document text
    • https://cdn.sqhk.co/jojojidatun/gjeghtH/95822594324.pdfIn PDF document text
    • http://bikomowaxibujoj.medianewsonline.com/best_online_data_science_masters_programs_india.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474211/normal_6045f2f3d5350.pdfIn PDF document text
    • http://gowanenutik.mypressonline.com/pakaserejimeripod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407299/normal_6000be639514f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://duxepivol.myartsonline.com/fearless_outro_song_1_hour.pdfIn PDF document text
    • http://xinifaduzinuvu.onlinewebshop.net/29835985640.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b0c7e24-8ad5-41f2-8ae4-569c890742fd/98008300994.pdfIn PDF document text
    • http://velelakolifuvu.onlinewebshop.net/john_deere_240_skid_steer_owners_manual.pdfIn PDF document text
    • http://fazaburifug.myartsonline.com/christmas_would_you_rather_questions_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2be79de-f29c-454d-b4e8-78696b51917f/nuvizadem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36d8404c-a685-4482-b7ad-19e9c0f2f07e/tajuvavasogasagepeniteg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f548fcab-3cca-4950-a9d3-fcf38f41f5f6/34343642637.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18c1c917-471f-400f-91e2-d01ca13f32ce/muweviwifumedonekajulokiw.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_off0000fa3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3B 5280 bytes
SHA-256: 6fca6ec6f5d54892275046eba06e9da653b5508d007631b01385f1776b44392b
font_01_sfnt_off00010c00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C00 10476 bytes
SHA-256: 4d443c1a57a00ff45a4f78ea6c5d86ec84b99aeab0600336697bb460b1430905

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