Malicious PDF — malware analysis report

Static analysis result for SHA-256 633e07d342f60749…

MALICIOUS

PDF

73.0 KB Created: 2021-03-25 22:53:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a4880d78659baa0ee9eca2d61499a89d SHA-1: 9a45a5abea99769daed010e79f2115a47d3c40e1 SHA-256: 633e07d342f60749e830fef80fd8236d4080decf5af07f8817612a3edf649113
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The presence of a large number of external links, many pointing to disposable hosting, suggests a link farm designed to redirect users to potentially malicious content. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://ponafet.ru/strik?utm_term=locomotion+jacqueline+woodson+cliff+notes PDF link annotation
    • https://cdn.sqhk.co/jakufomego/JONn4hj/gezasefoximevijumanipilim.pdfIn PDF document text
    • https://cdn.sqhk.co/tixaxelubigi/noJywCu/avatar_icons_free.pdfIn PDF document text
    • https://cdn.sqhk.co/pumafuki/TzkGLjj/chowka_kannada_movie_full.pdfIn PDF document text
    • https://cdn.sqhk.co/xupodafib/bHiajhR/t_mobile_facilities_manager.pdfIn PDF document text
    • http://laserisesiseno.getenjoyment.net/blockchain_blueprint_for_a_new_economy_by_melanie_swan.pdfIn PDF document text
    • http://rutekotugu.22web.org/neuralgia_del_trigemino_2016.pdfIn PDF document text
    • http://youralteragoods.com/avatar_maker_dogs_app484kf.pdfIn PDF document text
    • http://guzoseta.getenjoyment.net/definite_article_exercises_with_answers.pdfIn PDF document text
    • http://stepka2016.xyz/nova_icse_chemistry_lab_manual_class_9rz3vx.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzexesetaba/RdijhbK/7484862991.pdfIn PDF document text
    • http://pshcomonhere.xyz/savedalizefigiwupugkn1rs.pdfIn PDF document text
    • http://dubiniba.iblogger.org/brandenburg_concerto_3_piano.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pilomewolax.epizy.com/how_to_use_kronos_biometric_time_clock.pdfIn PDF document text
    • https://aefbb2f1-1cfc-4a48-aab2-d72547d84173.filesusr.com/ugd/2f3ac6_d6fc5156770249249983ad3325aa63a2.pdf?index=trueIn PDF document text
    • http://pajogapusifured.rf.gd/jofewifarutixosuzunutuzex.pdfIn PDF document text
    • http://gisebebego.rf.gd/bogamilosugozopejivatil.pdfIn PDF document text
    • https://810dce77-56ab-4324-823a-3549757f4eab.filesusr.com/ugd/1fad07_f748b149d0e2454ebfa2f364eb131bd5.pdf?index=trueIn PDF document text
    • https://633ee4a5-ef7f-4c35-8c02-ac6c60bc6361.filesusr.com/ugd/0ab374_7022df84626f4b1786209dccda89cc3d.pdf?index=trueIn PDF document text
    • https://7aff118d-26f6-4d76-9bc9-1838009e7274.filesusr.com/ugd/f80014_e9bc13eee25b4361887de5288f040f96.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_off0000e144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE144 5308 bytes
SHA-256: 18452018d675099e8990d7a9530d0ed7fed6033b7fc8ae6f48e3c22924c420e5
font_01_sfnt_off0000f35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35B 10448 bytes
SHA-256: d86bb75030494f989c4c795f1a9e990c9ade4201b43b522cf33a4b11c9985873

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