Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c15ab5ca1187f2e…

MALICIOUS

PDF

72.8 KB Created: 2021-03-04 06:21:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 91fe46476b4f41de812b8bc9e23ccba0 SHA-1: de989506a26801db9221a3ac9ef79c16d7469106 SHA-256: 8c15ab5ca1187f2e551675cf70bdf4889adaac306cdf1c4e9f38b2d3c2651f07
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, embedding numerous external URLs, many hosted on disposable domains, likely to direct users to phishing sites or for SEO manipulation. While no scripts were extracted, the PDF structure itself facilitates the redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://mezovuduw.ru/strik?utm_term=sharp+aquos+70+tv+weight PDF link annotation
    • https://cdn.sqhk.co/lagitesavap/ifgeFqe/highway_36_closure.pdfIn PDF document text
    • https://dumamigurox.weebly.com/uploads/1/3/4/3/134336195/3844875.pdfIn PDF document text
    • http://front-glass.space/g_a_ml_densidadscpy8.pdfIn PDF document text
    • https://cdn.sqhk.co/dabozijide/gj0hj3n/36759200239.pdfIn PDF document text
    • http://jotitojimo.mygamesonline.org/how_to_turn_on_an_ipod_shuffle_2nd_generation.pdfIn PDF document text
    • https://cdn.sqhk.co/fowoleleda/PheRgeG/strategy_games_free_play.pdfIn PDF document text
    • http://zememor.sportsontheweb.net/ego-t_vape_pen_battery.pdfIn PDF document text
    • https://cdn.sqhk.co/sozasusu/jeTjdgh/community_first_credit_union.pdfIn PDF document text
    • http://findattime.com/answer_key_jee_mains_cbt_2018v0l4h.pdfIn PDF document text
    • http://fishland.store/sukikurazazbxwt.pdfIn PDF document text
    • http://igafnd.org/blank_cinquain_poem_template57s71.pdfIn PDF document text
    • https://lividuxu.weebly.com/uploads/1/3/4/3/134354071/9969859.pdfIn PDF document text
    • http://sukutoxuwurif.mywebcommunity.org/super_mario_bros_2_nes_for_sale.pdfIn PDF document text
    • http://p-kavkaza.ru/bajrangi_bhaijaan_all_songs_free_320kbpsqern4.pdfIn PDF document text
    • https://cdn.sqhk.co/jupujezaxa/ijOABib/42841121226.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://faxiruvud.myartsonline.com/12815081303.pdfIn PDF document text
    • http://jimomurapujivo.onlinewebshop.net/1190837199.pdfIn PDF document text
    • http://jozilaro.atwebpages.com/vijux.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_off0000deba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBA 5652 bytes
SHA-256: 9aa1a9e5b4d49e1446dca11dffe230756b2f2982dfb94333eb24047641b8d6bb
font_01_sfnt_off0000f20b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20B 10656 bytes
SHA-256: 9691db03d1d3e994f97e5056e661097ba35a71fc23839f60c8d24eba25a8818c

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