Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f5d3db2943d8485…

MALICIOUS

PDF

87.8 KB Created: 2021-05-17 06:17:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f49b1d30c7a7b42d20a28527134493eb SHA-1: 2225520fb51673c314544048f0fc35605e76ef3e SHA-256: 2f5d3db2943d84850c71cdcaf38d17fe72815ec3423da5253e3fae1832d3563a
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains and subdomains, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://kuzutuzo.ru/strik?utm_term=what+can+you+do+with+a+degree+in+organizational+management PDF link annotation
    • https://cdn.sqhk.co/jesotipo/jhc8ja2/gojuxalipoluzami.pdfIn PDF document text
    • http://frontend-developer-azaynullin.site/843189002975sv6e.pdfIn PDF document text
    • https://cdn.sqhk.co/nuzinipaz/h4rhjhe/new_punjabi_movies_free_download_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484156/normal_6004514ebc718.pdfIn PDF document text
    • http://copyrighthelpcentral.com/motorola_xpr_3500e_price71ok6.pdfIn PDF document text
    • https://cdn.sqhk.co/livukigelo/hjVgjDF/car_mechanic_simulator_2020_para_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/foropogajag/xQxcrhf/simple_fruit_and_vegetable_carving_images.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501996/normal_5ff20f968b16f.pdfIn PDF document text
    • http://mx50off.info/zevuzodirp2nyl.pdfIn PDF document text
    • http://zoomita.space/file_profile._dat_dls_17as4aw.pdfIn PDF document text
    • https://cdn.sqhk.co/wapuvalapowa/irujgii/dokozawejizuzezanuwixiju.pdfIn PDF document text
    • https://cdn.sqhk.co/bomunerafoju/gjYa5ge/descargar_antivirus_para_celular_android_gratis.pdfIn PDF document text
    • https://cdn.sqhk.co/monasomeb/OKshjhi/lisa_denton_a_team.pdfIn PDF document text
    • https://cdn.sqhk.co/wulozonixuf/jcievsc/wavobu.pdfIn PDF document text
    • https://cdn.sqhk.co/pixefavenar/esTdiii/44701254342.pdfIn PDF document text
    • https://cdn.sqhk.co/tafolaku/NgeMici/datekenamekoxo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463286/normal_6068634e26d96.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/nowokil/what_is_a_cigar_ring_gauge.pdfIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/todujomogivegup.pdfIn PDF document text
    • https://e714dd98-3e42-4604-aba1-6d4b2506b1a8.filesusr.com/ugd/742965_1b34d909699746f68f10912426aa3281.pdf?index=trueIn PDF document text
    • https://a815f367-2516-4b88-9496-eed07d5c1eb7.filesusr.com/ugd/665c20_92cdf593f3a34f77ba22a49e1e3f7f7c.pdf?index=trueIn PDF document text
    • https://8d40832c-2e2b-4284-8151-bb35a16d80ac.filesusr.com/ugd/05d014_c8431d317a764e82b565a489a2e4926b.pdf?index=trueIn 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_off000103b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B1 5432 bytes
SHA-256: 86fb08d17b223d72204bbfde4ca3be9f26d8ac2bcb77b806a7bca65b0f6b247c
font_01_sfnt_off00011627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11627 11044 bytes
SHA-256: 46d29437f652929df6df210913641e80519dbb9181198398fa53b8ebdcee4ff2
font_02_sfnt_off00013c0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C0A 16240 bytes
SHA-256: 4009372b163b3f445d3f1f71485fdc914f33364c79904b121c1603929874874a