Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b118006a42df45c…

MALICIOUS

PDF

72.6 KB Created: 2021-03-02 11:47:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 9e65d82632309b93f4c91c32c361864c SHA-1: 6994eaf2ccf0baf4f3e6094731960319a7ef7921 SHA-256: 1b118006a42df45c71b4fbb05e94caa9529873aec20315f7a5190345bd289067
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one prominent URL suggesting a lure for downloading a 'biblical dictionary'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests a pattern of using disposable hosting for malicious links. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/strik?utm_term=descargar+diccionario+biblico+ilustrado+gratis+pdf PDF link annotation
    • https://cdn.sqhk.co/goxobuve/cA2Qgjy/flights_to_vegas_from_detroit_michigan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448724/normal_6024f20d8d399.pdfIn PDF document text
    • https://cdn.sqhk.co/fixuzigetir/AjbghJp/top_10_telugu_ringtones_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wajufuful.rf.gd/javascript_online_quiz_with_answers.pdfIn PDF document text
    • http://bozumux.epizy.com/brotherhood_video_song.pdfIn PDF document text
    • http://sivumokevidosib.rf.gd/end_of_project_evaluation_report_format.pdfIn PDF document text
    • https://s3.amazonaws.com/fukepez/sparkfun_arduino_starter_kit.pdfIn PDF document text
    • http://kagiwabiluwotel.epizy.com/numazuzobazujixozoze.pdfIn PDF document text
    • http://sezajuvijib.rf.gd/bomajavizapa.pdfIn PDF document text
    • http://joxumokuri.epizy.com/46693435285.pdfIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/community_service_log_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/legesiliv/pimazedox.pdfIn PDF document text
    • http://rigirulame.epizy.com/zagajorurojavas.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/jiwotafu.pdfIn PDF document text
    • http://silapopo.epizy.com/1027882646.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/climate_action_plan_template.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_off0000dbff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFF 5464 bytes
SHA-256: b56274ca8baa6053ea2e212c6937c0fcf77bd65d302a184c017d691dccd7914e
font_01_sfnt_off0000ee9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9F 11196 bytes
SHA-256: b3dd970e0d655299950aa32cacb8bd4cb300418692c9970b6040688779a42660

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