Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1ec9c4c7705fd92…

MALICIOUS

PDF

75.7 KB Created: 2021-03-23 20:56:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: fd562361a0ae4671741f181ab24fd87c SHA-1: b5eaf9f21fe2ce2d6205c5d976f92f91075854a2 SHA-256: b1ec9c4c7705fd92a51b44efebf3ef69193a0f07f6caf840f78584d6da6fd399
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external URIs, including one pointing to 'jacksth.ru', suggesting a phishing or malware distribution attempt. The PDF is structured as a link farm, likely to obscure the final malicious destination. No scripts were extracted, but the presence of multiple external links indicates an attempt to redirect the user to a potentially harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/strik?utm_term=representation+and+the+media+featuring+stuart+hall PDF link annotation
    • https://cdn.sqhk.co/wexunaveb/bwa2d6B/duvumibegidox.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411691/normal_600013f32b2a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495037/normal_5fdb72403e830.pdfIn PDF document text
    • https://cdn.sqhk.co/pesasotiro/sgZibLO/winner_soccer_evolution_elite_apk_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444647/normal_5fe1791607c43.pdfIn PDF document text
    • http://donuliwobem.iblogger.org/69955857191.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386839/normal_603d7460690bb.pdfIn PDF document text
    • https://cdn.sqhk.co/rapowipijes/hfjhhja/44384177895.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/d27f8200-9ce4-4d84-a971-5e1aa65abb25/scott_mueller_upgrading_and_repairing_pcs_23rd_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/9705121777.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2116b1e9-bc0c-41b1-9f81-3ee8a9bd31f6/xogiwilajidedixun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/917c5588-e45b-4ca1-8e41-01ed6442bff8/5082446756.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3058708-c526-469e-9930-606741e61dea/7008597005.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/why_i_want_a_wife_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35e78a6e-fc16-4451-a03e-cc2cee04923c/nagawipatasi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfbf9e31-c4c0-429b-b11e-0ec9fc8866e5/interview_questions_with_answers_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19d11662-1953-42a7-a0b3-1d6db26f8c73/where_can_i_get_a_cdl_medical_card_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb929704-22f3-4b7b-b86d-eb16e85bbff9/honda_generator_eu2000i_maintenance_kit.pdfIn PDF document text
    • https://s3.amazonaws.com/wowonesoribu/manipuwevufijusikero.pdfIn PDF document text
    • http://maxezexisog.rf.gd/jofif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d83c76e7-1d89-4b94-8785-4e77009ec47c/2005_nissan_murano_alternator_replacement_cost.pdfIn PDF document text
    • http://zomijoler.epizy.com/fubexeronisokibawajefori.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_off0000e945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE945 5464 bytes
SHA-256: 46b56b08b8db7ad3bd5db301ba4dceb2827a73e49ce91e7ff4049505138f07cb
font_01_sfnt_off0000fbb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB3 10920 bytes
SHA-256: cbc1bb7bfcc4e58c1c76b9cda0499a88f03b92737ea018b09be1e940a3790fd1