Malicious PDF — malware analysis report

Static analysis result for SHA-256 66344c2421dfa509…

MALICIOUS

PDF

84.4 KB Created: 2021-03-12 02:19:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 029c7d60f4463211840caa38361abfac SHA-1: 0a12883e10641343cb805e27dc43a9ed46161726 SHA-256: 66344c2421dfa5093e26f7dca652c50295fcec49da274dd806886e7db2afd60d
194 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and a potential phishing or malware distribution vehicle. The presence of numerous external links, including one pointing to 'gimoguvi.ru', suggests a malicious intent to redirect users. The ML classifier and ClamAV detection further support its malicious nature, indicating it likely serves as a dropper or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gimoguvi.ru/123?utm_term=bloom%2527+s+taxonomy+sample+questions+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409604/normal_6013b3511849e.pdfIn PDF document text
    • http://demask.space/61390553639qctoy.pdfIn PDF document text
    • https://cdn.sqhk.co/furigelo/kgiTha7/lizebowonatubifaxir.pdfIn PDF document text
    • http://vizionsmc.net/saeco_odea_giro_plus_descalingkcahw.pdfIn PDF document text
    • https://taburexil.weebly.com/uploads/1/3/4/3/134374137/6062044.pdfIn PDF document text
    • https://zarujiwimil.weebly.com/uploads/1/3/4/9/134900424/7885724.pdfIn PDF document text
    • https://safodejinuvi.weebly.com/uploads/1/3/4/7/134753113/xaxegewobonejerore.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461202/normal_5fd112d702f35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451744/normal_5fd33e9d7ab12.pdfIn PDF document text
    • https://nanupubixo.weebly.com/uploads/1/3/0/9/130969545/vowapasisi-xikasanezuwu-pinajewoxugeb.pdfIn PDF document text
    • https://kawuruli.weebly.com/uploads/1/3/0/8/130814241/xevawerudewi_wifofowubofege.pdfIn PDF document text
    • https://cdn.sqhk.co/xopuxuvop/gfhaSge/9066430379.pdfIn PDF document text
    • http://akmurzina.com/power_yoga_sequenceb28ag.pdfIn PDF document text
    • https://rorogujelid.weebly.com/uploads/1/3/4/7/134702732/9141409.pdfIn PDF document text
    • https://pebarefilegiz.weebly.com/uploads/1/3/5/3/135325086/1076062.pdfIn PDF document text
    • https://cdn.sqhk.co/gorubabor/0RjjhgT/saitama_training_quote.pdfIn PDF document text
    • https://cdn.sqhk.co/ximosufi/P8RQhgP/15363949619.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/71457597-cb1a-4699-8680-f7f96f723bbc/juegos_del_hambre_2_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72fde164-61fb-427e-a7e9-8182832c616a/panatonure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d39a7e01-5cab-42d7-b7b1-73ed9f938df1/invisible_city_netflix_imdb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b94a3697-9670-41c6-8596-70a0ed261e0e/director_of_public_relations_salary_nyc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9811ddd0-42a8-43a2-bc10-60a8c4269569/how_is_public_administration_optional_for_upsc.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f73a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73A 5468 bytes
SHA-256: d60269a4156da535327debcedaea3e11206b1ad40b1a95423d831c3cceda27f6
font_01_sfnt_off000109da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DA 10672 bytes
SHA-256: 8fe23d5ffda69b03f9c970d4b15946f773e3823fa4ba9d307dba8b0083da9934
font_02_sfnt_off00012e6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E6C 16176 bytes
SHA-256: 69b5c4e74bfa4014eec982f6fa61be57a0c45b8ed87a8eab45b747eace745dd2