Malicious PDF — malware analysis report

Static analysis result for SHA-256 e066f23fb1ff0a80…

MALICIOUS

PDF

91.6 KB Created: 2021-03-23 10:03:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f6c4b169592851065c59a1dcf0ae83d0 SHA-1: ac424969bbb0e99770ae53cc82eb3f942db31922 SHA-256: e066f23fb1ff0a80896c89bf84371c1ccea1688097b7f7daf915e93058e45581
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 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/wix?keyword=servicio+de+telefonia+movil PDF link annotation
    • http://rmk4sale.xyz/befizuh60zo.pdfIn PDF document text
    • https://sasominafa.weebly.com/uploads/1/3/4/3/134362810/5402704.pdfIn PDF document text
    • https://piligerababuge.weebly.com/uploads/1/3/5/3/135324290/nizufavakuji.pdfIn PDF document text
    • https://cdn.sqhk.co/jonimaze/JORiDhg/30348012594.pdfIn PDF document text
    • http://gravkamen.ru/how_to_make_a_homemade_soda_machinecx7m4.pdfIn PDF document text
    • https://cdn.sqhk.co/dodufiruw/cnhh7hg/vobetibemeg.pdfIn PDF document text
    • https://cdn.sqhk.co/foropogajag/hibhgKU/55444689000.pdfIn PDF document text
    • https://kalokawagubur.weebly.com/uploads/1/3/1/3/131398574/40e18523.pdfIn PDF document text
    • http://sokfresh.fun/acknowledgement_sample_for_undergraduate_thesisfzjmw.pdfIn PDF document text
    • http://reduslim-officialsite.site/colon_cancer65g1s.pdfIn PDF document text
    • https://cdn.sqhk.co/piravasufinu/Sif5qUh/auto_parts_automotive_technologies.pdfIn PDF document text
    • https://cdn.sqhk.co/jabezoxujo/ifgjjjC/9783661845.pdfIn PDF document text
    • http://ijmalan.xyz/how_to_pack_a_shoebox_for_shippingpyc5f.pdfIn PDF document text
    • https://juponujebiz.weebly.com/uploads/1/3/4/7/134773331/temadotiguzafin_vifurigutuwizo_kebixomi_rewiw.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/waxegatulo/audio_book_of_jasher_in_the_bible.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/attacking_network_protocols_forshaw.pdfIn PDF document text
    • https://s3.amazonaws.com/dukavunivifa/suboxone_drug_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jivagajamav/change_twitter_font_size_android.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/best_onyx_boox.pdfIn PDF document text
    • https://c3e810f9-371e-40b9-9a0b-4695a496ec77.filesusr.com/ugd/2c7c49_bc6a099982074ce8bf2fd71192b06938.pdf?index=trueIn PDF document text
    • https://53860ffb-5975-4088-b838-5c82367c2827.filesusr.com/ugd/0d2908_bd386e089fdf46ab920aaa79e12cad1f.pdf?index=trueIn PDF document text
    • https://18bc7be3-897e-46c1-a475-efc190d089bd.filesusr.com/ugd/62845f_b133742cc7584c7993f946eb6355b46e.pdf?index=trueIn PDF document text
    • https://f85e9a30-dbb9-40fd-a66d-53bd7daafe07.filesusr.com/ugd/1b9faa_6736aefb4b5943e9a140d377daa051ce.pdf?index=trueIn PDF document text
    • https://bdc3fad0-85dd-4e34-85f7-620d54d4ff6f.filesusr.com/ugd/10cedf_481db61283ef41e3addc9ef000099dec.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vavebufevodutob/26913198270.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_off00012487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12487 5152 bytes
SHA-256: 0960df25ce2735fabba244fb92961779b91593e501bf0c73ac990f8b2d14e5ba
font_01_sfnt_off00013604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13604 12840 bytes
SHA-256: e4da170ab6c89c521615a83c93c4d20b87035002bb03498ba78db560fea2b4e0