Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca5eb7824a9bf251…

MALICIOUS

PDF

71.9 KB Created: 2021-02-19 21:47:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0be41f8f155c937c054fc3bb2cc24fb4 SHA-1: d0f8d388a89aa4e8b7f1dc7d8fa37992934d0447 SHA-256: ca5eb7824a9bf251385fcfe2097fdaae9f45122077e8825a4d51718502f8dc6f
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous external URLs, suggesting it functions as a link farm or a redirector to phishing or malware distribution sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or content-luring attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/wb?keyword=how%20to%20write%20a%20news%20report%20example PDF link annotation
    • https://cdn.sqhk.co/mofijovelu/cLjdLii/nejexizakezefobupemubife.pdfIn PDF document text
    • https://cdn.sqhk.co/maputaliki/R4Bos6j/recorder_songs_for_beginners.pdfIn PDF document text
    • https://gafepodaxo.weebly.com/uploads/1/3/4/6/134606739/kulawebidedeb.pdfIn PDF document text
    • https://figapizezedop.weebly.com/uploads/1/3/4/3/134364787/ravivoz.pdfIn PDF document text
    • http://spindlndou.space/suffolk_county_pistol_permit_applicationjdhio.pdfIn PDF document text
    • http://naturaitalia.space/85626439067fxjx8.pdfIn PDF document text
    • http://huaweistoreukr.xyz/matematicas_1_bachillerato_libroky3x2.pdfIn PDF document text
    • http://buylettersonline.com/the_sims_3_pets_download_gratis_para_pc_em_portuguesxo2rk.pdfIn PDF document text
    • http://mrt-64.ru/infinity_train_book_3da73p.pdfIn PDF document text
    • http://robinmani.site/examenes_cae_resueltos9d3wz.pdfIn PDF document text
    • https://cdn.sqhk.co/wanaxowuwot/H8gegfc/gawevalojedem.pdfIn PDF document text
    • https://cdn.sqhk.co/xubipoxeguza/iiEaMie/laputuxeken.pdfIn PDF document text
    • http://italiahot.space/fetetogabimivotowodal757ec.pdfIn PDF document text
    • http://lnstagramverifiedsbadgeform.com/dorufapuxavetjsjdp.pdfIn PDF document text
    • https://pafegesufo.weebly.com/uploads/1/3/4/7/134719460/6432173.pdfIn PDF document text
    • http://jadebey-x.com/onomatopoeia_dictionaryq1ati.pdfIn PDF document text
    • https://dapodufez.weebly.com/uploads/1/3/3/9/133997146/1197508.pdfIn PDF document text
    • http://meetchambre.xyz/find_the_sum_of_the_interior_angle_measures_of_a_regular_polygon_with_13_sideszze4n.pdfIn PDF document text
    • http://sarkife.site/aptitude_tricks_for_placementsl3x3o.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000dfa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA6 5088 bytes
SHA-256: 0659323dccb54c1fbdbf53d943fc995c2e034af00970bb24337d16aa8fddea3f
font_01_sfnt_off0000f0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EF 9896 bytes
SHA-256: 643ba50914da0cea001ab9c5b75833338e5d0ed429152a3ea66795c52a4e67b8

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