Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b1c54402ea51889…

MALICIOUS

PDF

81.4 KB Created: 2021-04-05 07:43:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 5c53474946a72153764a2d23bffdfb22 SHA-1: 65b8f93e3c2d9bfb8948d4e7afafb4c0e13c437f SHA-256: 2b1c54402ea5188954c855b3f919aa103cf13190cd10a913f4e1dc6f3d058166
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to suspicious domains, suggesting it's part of a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://ponafet.ru/award?keyword=algebra+1+statistics+review+worksheet+pdf PDF link annotation
    • http://zexorusawuwurew.sportsontheweb.net/list_of_adjectives_in_english_grammar.pdfIn PDF document text
    • https://cdn.sqhk.co/vokipidelad/TDwjbn3/82378816488.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • http://gladkoe-telo.xyz/this_modern_love_will_darbyshiresel6g.pdfIn PDF document text
    • http://flowerport.store/how_to_study_for_the_phr_certificationcg7v9.pdfIn PDF document text
    • http://playmarket-online.com/new_moon_october_2020_spiritual_meaning3q3hf.pdfIn PDF document text
    • http://covidcapsule.world/4059506007ykkka.pdfIn PDF document text
    • http://allmedbook.com/basic_english_grammar_exercises_for_beginnerslzm93.pdfIn PDF document text
    • http://lnstagram-help-businesss.com/seguro_social_para_empregadas_domestvtops.pdfIn PDF document text
    • http://fomijegi.mypressonline.com/anesthesia_machine_check.pdfIn PDF document text
    • http://cethq.xyz/attack_on_titan_psp_game_for_androidfs6c1.pdfIn PDF document text
    • https://cdn.sqhk.co/pebekaja/8ggwjdZ/26921273391.pdfIn PDF document text
    • http://jabudapitu.scienceontheweb.net/41220376037.pdfIn PDF document text
    • https://cdn.sqhk.co/sadoburola/yP9hdih/drop_it_meme_fnaf.pdfIn PDF document text
    • http://ferategaj.scienceontheweb.net/80175058418.pdfIn PDF document text
    • http://rozewevojalel.sportsontheweb.net/1650155619.pdfIn PDF document text
    • http://gagivukamuw.getenjoyment.net/44393226608.pdfIn PDF document text
    • http://svarka-aurora.online/altered_form_giratinathv4h.pdfIn PDF document text
    • https://cdn.sqhk.co/kozosorole/YYhfbri/aasld_fatty_liver_guidelines.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nujidurib.rf.gd/animation_movie_maker_software_free.pdfIn PDF document text
    • http://vejegaba.atwebpages.com/bokonokozizosenikoderowu.pdfIn PDF document text
    • http://zesakek.epizy.com/manufanejuwujusimeb.pdfIn PDF document text
    • http://webuvur.epizy.com/noberegefuje.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_off0000fcbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBC 5812 bytes
SHA-256: c4f989672843ac6c6324de87c9c1fa10b40528a16eb2d72b75198c5b41460247
font_01_sfnt_off0001109f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109F 11600 bytes
SHA-256: 4679dfc1b02035112a254731047de8c413d1ba3d92475fbd4f1807b8215b374c

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