Malicious PDF — malware analysis report

Static analysis result for SHA-256 aafc415ac3a00803…

MALICIOUS

PDF

75.8 KB Created: 2021-03-23 03:54:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d6adf8421b70848dbaa685811f5fdd23 SHA-1: f7cdadcdaf264909a0650424ac87a7d41f863be4 SHA-256: aafc415ac3a00803cfb13fa4f2a65f07b466857bc3234986cb48841c21c0eaed
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with one pointing to 'jacksth.ru', which is flagged as suspicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting a malicious intent to obscure the true destination or host multiple phishing/malware sites. The ML classifier and ClamAV detection strongly indicate malicious content, likely a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/123?utm_term=bolton+v+coventry+match+report PDF link annotation
    • http://metinozub.iblogger.org/3rd_grade_common_core_math_fractions_worksheets.pdfIn PDF document text
    • https://cdn.sqhk.co/xufojidaju/bhgjfYm/69495415280.pdfIn PDF document text
    • http://larokamexi.sportsontheweb.net/spectrum_tv_remote_control_user_guide.pdfIn PDF document text
    • http://suvolupijiro.mygamesonline.org/tecnologia_limpia_definicion.pdfIn PDF document text
    • http://zagodutaf.getenjoyment.net/gufefosirotitufenodiz.pdfIn PDF document text
    • http://lozomaneje.getenjoyment.net/69681383247.pdfIn PDF document text
    • https://cdn.sqhk.co/dasofuduveje/jb7yhc5/warship_battle_app_download.pdfIn PDF document text
    • https://cdn.sqhk.co/tijinujul/KOpujh9/fall_cake_decorating_ideas.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/3b2fc2a8-d3d1-4aa1-8ff2-e7345e9416d2/baby_bjorn_chair_weight_limit.pdfIn PDF document text
    • https://s3.amazonaws.com/purufiz/betonline_poker_for_ipad.pdfIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/atomic_bombing_of_japan_source_analysis_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7e57d54-1b88-44cb-92fb-a37a0bcbdbd0/47582894232.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db034214-a9a5-4ef6-b497-c946cad76ad5/no_bill_of_rights_no_deal_answer_key_icivics_activity_side_a.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b890336-f5f0-4115-ade3-bae463cd1640/33029650712.pdfIn PDF document text
    • http://fobunedofakane.rf.gd/98094362775.pdfIn PDF document text
    • http://posazexemonepen.rf.gd/7410796382.pdfIn PDF document text
    • http://zazaluvuzusu.rf.gd/bolojepikotomogak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e80859c7-e490-4b6c-ad45-d5ae490ee68c/how_to_replace_battery_in_skycaddie_watch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7c77d5d-af53-431c-ae1f-16915dee0f1a/what_does_sahib_mean_in_sikhism.pdfIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/walgreens_boots_alliance_uk_email_format.pdfIn PDF document text
    • http://potosalusuk.rf.gd/kefibema.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_off0000edf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF2 5204 bytes
SHA-256: 7e15cad227613e63553ae6f77d71976185e93a1e2bf2ef189441ac23eafd9643
font_01_sfnt_off0000ff87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF87 10084 bytes
SHA-256: 2df484e6d884d7bdb93de3d0085e25f0d29e6e85efd8b21636dc4d4dad4ee8ef

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