Malicious PDF — malware analysis report

Static analysis result for SHA-256 67dae08d0f529923…

MALICIOUS

PDF

78.0 KB Created: 2021-05-09 04:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4c805d2e200081f14c2beff6716f907 SHA-1: 7f1bb65907106833688fce2b1d75b9d0ec90191e SHA-256: 67dae08d0f5299238cfb14aa856811769ccdd8da739f9a68e723f81015389179
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of a large number of external links, including a link farm, strongly suggests a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf', indicating it was likely generated programmatically to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/strik?utm_term=hp+compaq+presario+cq57+specifications
    • https://cdn.sqhk.co/mowasikuso/Pnqglgj/wumidasotezabipuvomanagep.pdf
    • https://cdn-cms.f-static.net/uploads/4488116/normal_5fd9086d2e1c4.pdf
    • https://cdn.sqhk.co/kumotuxijufu/ggcJAgd/wexudununesuzanowofebi.pdf
    • http://tinonijo.iblogger.org/wild_animals_pictures_with_names_in_english.pdf
    • https://cdn.sqhk.co/naveropifo/R3jaihg/51801403657.pdf
    • https://cdn-cms.f-static.net/uploads/4487200/normal_6014f15f7e0f9.pdf
    • https://cdn.sqhk.co/zinoliwomi/gjjgjjF/vidodupoloniluvusisiwilof.pdf
    • https://cdn-cms.f-static.net/uploads/4486523/normal_603fc18203e47.pdf
    • https://cdn.sqhk.co/jajejige/mjhVgoT/44877211639.pdf
    • https://cdn.sqhk.co/limexofure/4bhcPgf/1218300090.pdf
    • https://cdn.sqhk.co/letarezetap/jjgcjiX/bluestacks_hd_app_player.pdf
    • https://cdn-cms.f-static.net/uploads/4427811/normal_602867e279dfd.pdf
    • https://cdn.sqhk.co/mugegiduveb/qOijVhg/1000_health_tips.pdf
    • http://fepemewavitik.66ghz.com/la_biblia_en_audio_libro_de_mateo.pdf
    • https://cdn.sqhk.co/xenumobavun/qZzicBo/72143304852.pdf
    • https://cdn.sqhk.co/moserusoba/eloZ5Il/xedagujiwegapekiguvuz.pdf
    • https://cdn.sqhk.co/lidumezuvir/o37hiZY/71003764425.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0d3c4653-ec4b-4b04-9c20-59e348ba858e.filesusr.com/ugd/62200f_0c5e71526a8d47138090151b3a2d8527.pdf?index=true
    • http://tuvuwibeguz.epizy.com/algorithme_pcime.pdf
    • https://1f9cfe0c-d655-4514-b58a-75380282e405.filesusr.com/ugd/d31784_31f9544f831349498fdc9efdb4251ac8.pdf?index=true
    • https://d6b7b3c7-8429-4d82-9d75-5d5d09e763cc.filesusr.com/ugd/a8c229_23f7474edb6d47b9b9216df6f9f9177c.pdf?index=true
    • http://wupafar.rf.gd/acknowledgement_letter_for_receiving_documents.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f195.bin
9e7cd7b743d7c725c9680659936f9f2ee17bc3f628f382f27f5a4d765e8e4b84		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF195 5420 bytes
font_01_sfnt_off000103fc.bin
38d350b7099290f04cdf71ee4e71258a89dbffbe2b13385e67c4d64a0249bb72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103FC 11372 bytes

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