Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec583275cd0b44d1…

MALICIOUS

PDF

76.8 KB Created: 2021-01-10 11:40:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 38d61f6fd0c8ce1c45e107e26c89455d SHA-1: eb84da21f97e6a53088e5f1757f5e22f6797596c SHA-256: ec583275cd0b44d144761490e25e5dbe60150b34bd063c7b27d26ceddd492005
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, pointing to various PDF files hosted on multiple domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the structure and numerous external links suggest an attempt to redirect users to malicious content.

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 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.
  • 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://traffine.ru/123?utm_term=inter+2nd+year+results+2016+name+wise+with+photo PDF link annotation
    • https://cdn.sqhk.co/guledijuxi/SgjifBW/38771292560.pdfIn PDF document text
    • https://cdn.sqhk.co/puvegipuros/ifOiaVw/51128022011.pdfIn PDF document text
    • https://xexovelez.weebly.com/uploads/1/3/0/8/130813416/4964160.pdfIn PDF document text
    • https://cdn.sqhk.co/gufezitaxato/lBLgfs7/2300616956.pdfIn PDF document text
    • https://cdn.sqhk.co/pugusomimoro/ejbkgg2/81370715531.pdfIn PDF document text
    • https://cdn.sqhk.co/jokutevek/heiiu8P/baby_alive_grows_up_happy_vs_dreamy.pdfIn PDF document text
    • https://cdn.sqhk.co/vipabure/idkmNhd/95872947663.pdfIn PDF document text
    • https://cdn.sqhk.co/kovezozeseg/hhtjjhf/drive_in_movie_theater_nj_bell_works.pdfIn PDF document text
    • https://cdn.sqhk.co/velujuvaxal/20P4Ada/prison_break_season_5_episode_10_netflix.pdfIn PDF document text
    • https://najusijas.weebly.com/uploads/1/3/5/4/135400897/fenowew.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvepiwedo/INggPhf/best_smart_charger_for_airsoft.pdfIn PDF document text
    • https://kuxifegofemiza.weebly.com/uploads/1/3/4/8/134865321/039d4ef.pdfIn PDF document text
    • https://gabejopow.weebly.com/uploads/1/3/4/5/134597712/c2c634ee6b7641.pdfIn PDF document text
    • https://sifijaxamop.weebly.com/uploads/1/3/4/3/134332722/gepaboxadanaxuvudis.pdfIn PDF document text
    • https://cdn.sqhk.co/xolafunodo/fhdhjaX/carrom_board_game_play_with_computer.pdfIn PDF document text
    • https://buresususotolo.weebly.com/uploads/1/3/2/7/132710635/4236e4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA0 5692 bytes
SHA-256: 68239c3004638407b8385de83b150629d93caa2eed2884b1c3de4a6e6bc6342b
font_01_sfnt_off0000f2e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E1 10668 bytes
SHA-256: 136276a82950243207718e7475b2caa0841b665cff5cf6ab44cff91e2d85924c
font_02_sfnt_off0001176e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176E 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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