Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fe59419e81eadf2…

MALICIOUS

PDF

82.1 KB Created: 2021-04-04 20:28:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3ef6212ef466a6c1db1a595e07bd378 SHA-1: d37d4efcc0616455436153e29a15080064ea6255 SHA-256: 4fe59419e81eadf22fc3d6b075a8325c77ad9cbcf0fb87ff99bcb778b3d97735
156 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. It contains numerous external links, with heuristics identifying a 'PDF_SEO_LINK_FARM' and 'PDF_URI' firings pointing to suspicious domains like 'soxebez.ru' and 'birebap.scienceontheweb.net'. The document body, though heavily obfuscated, suggests a lure related to search terms, reinforcing the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://soxebez.ru/wix?keyword=como+jugar+monopoly+shop+play+win
    • http://birebap.scienceontheweb.net/rulaj.pdf
    • http://nibewubixela.getenjoyment.net/54184511413.pdf
    • https://sokasabakowupop.weebly.com/uploads/1/3/4/0/134012989/pesonusizimunudurib.pdf
    • https://cdn-cms.f-static.net/uploads/4416791/normal_6029060852fba.pdf
    • https://vilofezilo.weebly.com/uploads/1/3/0/7/130740065/5291054.pdf
    • https://static.s123-cdn-static.com/uploads/4428035/normal_6002e74f43796.pdf
    • https://titobabedax.weebly.com/uploads/1/3/4/3/134317276/df028ae.pdf
    • https://cdn-cms.f-static.net/uploads/4375070/normal_605f53f4ecb0d.pdf
    • https://cdn-cms.f-static.net/uploads/4478928/normal_60641ede55405.pdf
    • https://lutomired.weebly.com/uploads/1/3/5/3/135316507/f4d8c589fc00.pdf
    • https://kerozusokenizil.weebly.com/uploads/1/3/1/3/131383247/bdad3e87a60a36.pdf
    • http://bidizujimon.getenjoyment.net/2013_jeep_grand_cherokee_recalls.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tafiwepamubov.atwebpages.com/1_what_are_the_4_phases_of_mitosis.pdf
    • http://makakanow.onlinewebshop.net/what_companies_practice_conscious_capitalism.pdf
    • https://s3.amazonaws.com/zinudipir/42528244330.pdf
    • http://magegefopo.atwebpages.com/binding_the_strongman_over_america.pdf
    • http://kesolimasakifi.myartsonline.com/93142346924.pdf
    • https://s3.amazonaws.com/lukepepe/11028905395.pdf
    • https://s3.amazonaws.com/luxaduzimase/50037256632.pdf
    • https://s3.amazonaws.com/tetofamuxulil/81378342831.pdf
    • https://s3.amazonaws.com/jirebonudur/87833033222.pdf
    • https://s3.amazonaws.com/nufidibodudulad/tipos_y_clasificacion_de_funciones_matematicas.pdf
    • http://viniwowosur.onlinewebshop.net/85866323332.pdf
    • https://s3.amazonaws.com/zonivezada/anjaana_anjaani_full_hd_movie.pdf
    • https://s3.amazonaws.com/fizaxo/formule_pour_calculer_l_ge_gestationnel.pdf
    • https://s3.amazonaws.com/zarelusipofox/cisco_anyconnect_windows_10_client.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_off0000ff29.bin
26b6fc9340bf818c6209af96f189b0a8e6d8a22931020b71d9a82220b210bb24		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF29 5408 bytes
font_01_sfnt_off00011174.bin
5e30dc2a09fa0658b94eb593492d7a26145b1be300522d6c5cdf0e3708a29f3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11174 11852 bytes

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