Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b25c65aca2e5ee8…

MALICIOUS

PDF

80.4 KB Created: 2021-04-26 08:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0a6a457eca4fddc82f2c8a9859e0dca5 SHA-1: 5d6b8f43d057413967027910f575dd9e980c7429 SHA-256: 5b25c65aca2e5ee85058992494186b7ea07244d2bd71bbb6100cb345d828f459
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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.
  • 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://jottigo.ru/strik?utm_term=how+to+prepare+for+sat+in+9th+grade PDF link annotation
    • http://legobibeli.22web.org/99357360826.pdfIn PDF document text
    • https://cdn.sqhk.co/rarukaboz/jgi4ibv/download_game_basketball_battle_mod_apk.pdfIn PDF document text
    • http://kuxufijum.iblogger.org/another_word_for_automated_answering_machine.pdfIn PDF document text
    • https://cdn.sqhk.co/makafabakuna/Rhhjh6b/fujabuzukiroba.pdfIn PDF document text
    • https://cdn.sqhk.co/feluxolid/Kgcgifj/sago_mini_boats_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/xurinuwame/eNjg3ic/world_basketball_championship_unblocked_bobo.pdfIn PDF document text
    • http://1xbet-registrat.site/how_to_find_radius_of_cylinder_with_height4zfvc.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://ziwewixowele.sportsontheweb.net/rasivamugiruxunib.pdfIn PDF document text
    • https://cdn.sqhk.co/rilowikapaz/2zNoxZZ/pogromcy_duchow_piosenka_tekst.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://putatufene.rf.gd/wevamav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05d5e28c-12bc-4ebc-8f70-82ae629f630c/sabojukagugujesegisa.pdfIn PDF document text
    • http://wugujub.onlinewebshop.net/47416858222.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71ad771f-7e6a-4ae3-bf87-4ec2387ad1f9/my_cloud_storage.pdfIn PDF document text
    • http://risozipenolifiz.rf.gd/fungsi_manajemen_penggerakan_actuating.pdfIn PDF document text
    • http://lusalelafujijo.epizy.com/61905287998.pdfIn PDF document text
    • http://wowelotiti.epizy.com/30593877108.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_off0000fd20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD20 5480 bytes
SHA-256: c8b1ebbbb2dfdfe73844f4ce7732a6110ce105b5c0bd82dad2439c61f750d136
font_01_sfnt_off00010fd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD0 10912 bytes
SHA-256: 111ab267038d506755a3ecc4165f0528447e5d534305eb1e60ddaf4f43c33b00

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