Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5245669015da85c…

MALICIOUS

PDF

91.8 KB Created: 2021-04-10 22:00:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a04b76f35ddf83de1a7b427b023619d5 SHA-1: 996b57a454f26e6b60fae5e84e34e5dd0b76f0b3 SHA-256: c5245669015da85c6e1f9fea8f8cc9fd44bc9d4b1546e67f57ce2079bc4015e0
206 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains multiple external URLs, with one pointing to 'kuzutuzo.ru' which is associated with a link farm and potentially malicious content. The document also employs social engineering tactics, specifically a 'ClickFix' lure, instructing the user to copy and paste commands into a terminal, which is a common method for executing downloaded payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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/strik?utm_term=windows+volume+up+down+shortcut PDF link annotation
    • http://helpcopyright-service.com/47722393146gfbvz.pdfIn PDF document text
    • http://dapajurop.mygamesonline.org/54948471637.pdfIn PDF document text
    • https://cdn.sqhk.co/dejuxafe/r0jdido/monkey_bread_with_biscuits_in_loaf_pan.pdfIn PDF document text
    • http://mapotilij.mygamesonline.org/86184783844.pdfIn PDF document text
    • http://rankingcoach-seo.com/jonilufebabezi91cqn.pdfIn PDF document text
    • https://cdn.sqhk.co/togokitaz/gdPIjcs/mugadogifogepewatazikif.pdfIn PDF document text
    • https://cdn.sqhk.co/dudurejavir/pf1RtcG/wurazudakabizexixasonavox.pdfIn PDF document text
    • http://digosige.mywebcommunity.org/how_do_i_electronically_sign_a_in_microsoft_edge.pdfIn PDF document text
    • http://jepenufi.getenjoyment.net/minn_kota_-_powerdrive_45_bt_i-pilot_spot_lock.pdfIn PDF document text
    • http://sumazubaviloxog.22web.org/palefanexunek.pdfIn PDF document text
    • http://tersq.fun/340560880785gcgv.pdfIn PDF document text
    • https://cdn.sqhk.co/tatonabufule/idPihLk/kodimifujunefexanagugu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8eb0a0ea-73f3-4e06-906b-0f0b9ddf4156/90279646441.pdfIn PDF document text
    • https://s3.amazonaws.com/gogunabones/kjv_bible_ebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68d7655f-b85a-4816-a066-fe592c9faf45/teaching_students_with_special_needs_in_inclusive_settings.pdfIn PDF document text
    • https://s3.amazonaws.com/bexolamabad/game_attack_on_titan_offline_mod_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cc9fe5b-cb35-41bb-9550-bcdccc9f8fcf/vumetan.pdfIn PDF document text
    • https://s3.amazonaws.com/rumezo/lezimiditusetitexa.pdfIn PDF document text
    • https://s3.amazonaws.com/wujapu/functionalist_architecture.pdfIn PDF document text
    • http://tovukazemav.epizy.com/warm_fuzzies_and_cold_pricklies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38a790f8-dc97-4acc-925d-b290eba0dbb5/rewapokurudetelanadi.pdfIn PDF document text
    • http://wulogakuzi.rf.gd/mg_university_bcom_syllabus.pdfIn PDF document text
    • http://pozisez.rf.gd/babbity_rabbity.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb465496-ffaf-4da9-824f-13561a4be4ff/fizavowezif.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/85708597359.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001110e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110E 5268 bytes
SHA-256: 50d2cbc13c5762011d35526fd2d80011d3d914e437b53f365a9de69990267e40
font_01_sfnt_off000122e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E9 11744 bytes
SHA-256: abcc4793c88cfecf13da0a180a48e15b354a55e8475e79ed4b85c4ea2067ff6b
font_02_sfnt_off00014b16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B16 16576 bytes
SHA-256: 899ccc2a6a8bda55742108d06bf2fba8c9fd4862a56bafd7913faffa19ea2976

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