Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1d20568e2336003…

MALICIOUS

PDF

78.2 KB Created: 2021-03-02 14:40:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 709befb0d042dd11d6c91ad8eebed704 SHA-1: 20908be733cde3a561e6bbf6b8ef45174d5ee0f8 SHA-256: d1d20568e233600345cdfe7ac12de3f160980b3b8cbb7e6446b52dbc402e0d8d
186 Risk Score

Malware Insights

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

The sample is a PDF containing a large number of external links, many of which point to disposable domains or subdomains, indicating a link farm designed to host malicious content or redirect users to phishing sites. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm suggest an attempt to deliver a second-stage payload or facilitate phishing. The ClamAV detection further supports its malicious classification.

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://xezojetit.ru/strik?utm_term=does+everyone+die+at+the+end+of+ff7 PDF link annotation
    • https://cdn.sqhk.co/bikegola/ge2jhhh/live_streaming_news_los_angeles.pdfIn PDF document text
    • http://fruit-italy.space/islands_in_the_stream_song_downloadceykr.pdfIn PDF document text
    • https://cdn.sqhk.co/xexisini/utEhfQV/sledziona_dodatkowa_po_angielsku.pdfIn PDF document text
    • http://damita.fun/305200894848sd8x.pdfIn PDF document text
    • https://cdn.sqhk.co/kekoseni/ocgezkQ/soccer_games_penalty_shootout_2010.pdfIn PDF document text
    • http://afracheat3.xyz/39073113393g7coo.pdfIn PDF document text
    • http://anarchymedya.com/evergreen_chords_knuckle_puck0efc3.pdfIn PDF document text
    • https://cdn.sqhk.co/renerolodepu/irgchg2/horizon_flight_simulator_2019_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/kadunila/MietXFM/clash_of_tanks_download.pdfIn PDF document text
    • https://cdn.sqhk.co/juxajomuz/gfbidFX/58031825811.pdfIn PDF document text
    • https://cdn.sqhk.co/juzosugun/5GGhguw/zuvalijakopone.pdfIn PDF document text
    • https://pulezigo.weebly.com/uploads/1/3/4/6/134600697/navodu-jiwakukufo-xikutarebaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wemazun/what_adaptations_do_lions_have_to_survive.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/40331430471.pdfIn PDF document text
    • http://fujafinu.epizy.com/n_s_f_ka_full_form.pdfIn PDF document text
    • https://s3.amazonaws.com/vetamedisoz/wuveg.pdfIn PDF document text
    • http://fukorow.epizy.com/seperofagizomonejone.pdfIn PDF document text
    • https://s3.amazonaws.com/pirosisob/descargar_mini_world_block_art_apk.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_off0000f3ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EC 5204 bytes
SHA-256: 5594243be04673a9adad0994dc33ba4fd0f1a954db655d8bf6c9f75d17dd4a71
font_01_sfnt_off000105b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B2 10964 bytes
SHA-256: 2ead4e89f51eab2f42ff76a31bb431f83920fee3f59f2355c4ccaa46de146e38

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