Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1909a4bc0a01339…

MALICIOUS

PDF

76.3 KB Created: 2021-01-29 08:44:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 482b3c2c5df46d0c7c226d174e06281a SHA-1: e7198a0ec9ae45a939d229d4e8d32f125d2a4eff SHA-256: e1909a4bc0a01339ac2bf3b64cdd4c900860f3b882f497c814e1b18a2ed1f22f
126 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of hosting many links on potentially untrusted domains, often associated with malicious activity. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/123?utm_term=ice+cream+bike+business PDF link annotation
    • https://cdn.sqhk.co/zogobadakedu/eDHGVje/origami_paper_crane_legend.pdfIn PDF document text
    • https://nozijuga.weebly.com/uploads/1/3/4/6/134698325/papanirezizi.pdfIn PDF document text
    • http://leftoutclub.com/college_algebra_5th_edition_beecherkvu6s.pdfIn PDF document text
    • http://sexugaweguko.iblogger.org/android_won_t_connect_to_public_wifi.pdfIn PDF document text
    • http://beautysss.site/la_soledad_de_un_cuerpo_acostumbrado_a_la_herida_poemasdd8c6.pdfIn PDF document text
    • http://shoop-fn.ru/suxesedakakivuwukati2jfpz.pdfIn PDF document text
    • http://getliterate.online/angle_relationships_puzzle_worksheetbng4y.pdfIn PDF document text
    • https://cdn.sqhk.co/fijumirana/jiciijg/kegidodewataf.pdfIn PDF document text
    • http://housefashion.ru/15464397190o19kw.pdfIn PDF document text
    • http://teenagetutor.online/nojejitepixem8ki3v.pdfIn PDF document text
    • http://ekzo-fruit.ru/amcon_act_2019jgjag.pdfIn PDF document text
    • https://cdn.sqhk.co/zefafulolit/hfhakuX/11414699121.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://guzumirofega.epizy.com/minions_4_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/rutereligixijonibarala.pdfIn PDF document text
    • http://notewewagegev.rf.gd/envision_florida_algebra_1_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/wupagivoz/narasimha_audio_songs_free.pdfIn PDF document text
    • http://mimonutemabase.epizy.com/behringer_xr18_software_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/webifagupatizinog.pdfIn PDF document text
    • https://s3.amazonaws.com/dekogamik/car_rent_agreement_format_india.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_off0000ef39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF39 5052 bytes
SHA-256: 0033258edbd7883f4f0542b2cb8254eacdd47f40976329de3ff56d39eec7ff17
font_01_sfnt_off00010050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10050 10448 bytes
SHA-256: 9b073de09a119159cdd3c872f12d78c157c855b520b7dd36059b19397c445b60

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