Malicious PDF — malware analysis report

Static analysis result for SHA-256 5422532a4228fbf5…

MALICIOUS

PDF

78.8 KB Created: 2021-04-18 13:04:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e86985937230909fb961016c3464d562 SHA-1: 23b919045927b3c406ea9ae022c832db643c23d8 SHA-256: 5422532a4228fbf53bfbca5705cecb79e33046235b2d437dae2a9a6b60541726
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, with several pointing to disposable domains and one specifically using a 'strik' parameter that suggests a phishing or malicious redirection attempt. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest the document is designed to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://xajibur.ru/strik?utm_term=baby+girl+names+2019+unique+with+meaning PDF link annotation
    • http://idealsit.fun/zatixekowon35bc.pdfIn PDF document text
    • http://vetejula.mypressonline.com/bakanegan.pdfIn PDF document text
    • https://wupirevedog.weebly.com/uploads/1/3/4/7/134709422/wipabezibamupadali.pdfIn PDF document text
    • https://cdn.sqhk.co/litonesi/hO01Bhf/zapujabunebezodixumikow.pdfIn PDF document text
    • https://nabumeludofava.weebly.com/uploads/1/3/4/3/134373896/cf397253340f.pdfIn PDF document text
    • http://microbladingeyebrowsdallastx.com/arere_ekkada_ekkada_na_pranam_song9jur3.pdfIn PDF document text
    • http://aycotoro5.xyz/how_to_find_out_your_wiper_blade_size87r1k.pdfIn PDF document text
    • https://galesarenad.weebly.com/uploads/1/3/4/3/134380117/98914.pdfIn PDF document text
    • https://pexiseziburenof.weebly.com/uploads/1/3/4/6/134685472/4eab6df1a.pdfIn PDF document text
    • http://nomokesus.sportsontheweb.net/investment_banking_products_and_services.pdfIn PDF document text
    • http://bumawusuka.mypressonline.com/78712731623.pdfIn PDF document text
    • https://genofegewad.weebly.com/uploads/1/3/0/7/130776157/f60be.pdfIn PDF document text
    • https://cdn.sqhk.co/wodelaganav/dsN7bhg/interesting_facts_about_the_main_asteroid_belt.pdfIn PDF document text
    • https://cdn.sqhk.co/bujugasefoli/he60PtG/stcw_2010_manila_amendments.pdfIn PDF document text
    • https://cdn.sqhk.co/gulizate/M8higc5/60408429686.pdfIn PDF document text
    • https://cdn.sqhk.co/banamasuvaj/taejhja/qu_you_tutorial.pdfIn PDF document text
    • http://libertinemodels.com/best_kafka_short_stories_redditazo5h.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/90239627682.pdfIn PDF document text
    • https://s3.amazonaws.com/gezejoputiwinu/95941693100.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/68637629018.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/25125398660.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef12a093-57af-4a6e-be4e-1834f9849c92/batman_hush_comic_online_latino.pdfIn PDF document text
    • http://vujijemu.atwebpages.com/duwulebogotofuxodalu.pdfIn PDF document text
    • https://s3.amazonaws.com/wunojipu/manual_testing_interview_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c7864e9-ecd3-4e69-a1b0-cdf3d561874e/intel_dx58so_bios_update.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99eb76fa-5e8c-4792-b70a-3fce425ce88c/roland_fa_6_review.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_off0000f5ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CA 6088 bytes
SHA-256: d27ca1f537af5a875122fa023d81ff7440c0b293cf85af8abaeb755227d1667c
font_01_sfnt_off00010a6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6D 10368 bytes
SHA-256: 1c54bbd4c385d46bb272b66e01d3f20a9df03d9496827c90d2b033b18cbc1dd4