Malicious PDF — malware analysis report

Static analysis result for SHA-256 e246a26aee5e7c9c…

MALICIOUS

PDF

91.8 KB Created: 2021-03-11 16:05:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 1df7a39b7b4db06efefe7b77259ab2d3 SHA-1: dfecae1e1c1f30b585448d2f8fe1e93965c78812 SHA-256: e246a26aee5e7c9cd26a05f5b3ec7b34a224e3f89eb081762fdfdaecf2188ce2
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a primary focus on `https://ponafet.ru/strik?utm_term=ascii+table+c%252B%252B+pdf`. Heuristics indicate this PDF is part of a link farm hosted on disposable domains, strongly suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm its malicious nature. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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 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://ponafet.ru/strik?utm_term=ascii+table+c%252B%252B+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379471/normal_6014e83840e92.pdfIn PDF document text
    • http://jalazekesofijot.medianewsonline.com/honeywell_hcm-350_humidifier_for_sale.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475219/normal_60248e44c56c0.pdfIn PDF document text
    • http://vijexibat.mywebcommunity.org/how_to_get_a_real_estate_agent_license_in_washington_state.pdfIn PDF document text
    • http://fafuzum.sportsontheweb.net/what_are_all_the_warrior_cats_names.pdfIn PDF document text
    • https://xulavuxedipi.weebly.com/uploads/1/3/4/0/134017657/mezobixef_miwasudikume.pdfIn PDF document text
    • https://wokonupojelofa.weebly.com/uploads/1/3/5/3/135351156/kirujex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380531/normal_5fdcb5b325a26.pdfIn PDF document text
    • http://filajupixi.iblogger.org/ranger_z20_boat_cover_for_sale.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366045/normal_6031c63d137e4.pdfIn PDF document text
    • https://patewowuxafopon.weebly.com/uploads/1/3/4/5/134595548/74e04.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4a0f17ac-6ce6-4c05-9546-25c48d39d9f7.filesusr.com/ugd/cd79e3_f3e169d3a2bc42f9a667bbeab9e3e635.pdf?index=trueIn PDF document text
    • https://8ed62699-7d02-4439-b935-4286882ef7d4.filesusr.com/ugd/229b11_c622557b921448ad86ef443f97c20ebe.pdf?index=trueIn PDF document text
    • http://xarifilaf.rf.gd/57192080176.pdfIn PDF document text
    • http://belojegepi.epizy.com/magazine_design.pdfIn PDF document text
    • https://5a4e7950-e122-4b3c-9cf7-894e7f5b1216.filesusr.com/ugd/76aeb6_8492ebddf13545009e5b4d25dc182648.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc450e58-b6e8-4b37-84d7-083a7b70aa14/return_ascii_value_c.pdfIn PDF document text
    • https://89f68ddc-9f98-4e60-8afa-3e0ca6603e9e.filesusr.com/ugd/4725f1_dbccdd93f1dd4d2a8ba0e07dc6e50115.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/de45fa5e-eae0-418c-b23b-87b996c979ce/murisavudewafisixomobaso.pdfIn PDF document text
    • http://nanefelizili.epizy.com/93087496288.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/888c8d71-e397-4c43-8220-3692f75ee3b0/tafanebiviwa.pdfIn PDF document text
    • http://pazepoxi.atwebpages.com/accra_map.pdfIn PDF document text
    • http://vowurereluvox.epizy.com/descargar_el_talmud_complet_en_espaol_gratis.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_off000109d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D2 5184 bytes
SHA-256: 7649d2d94e3843891833d745f52936b7c2f7b8e61439a6a84457ad127f3d5029
font_01_sfnt_off00011b87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B87 27152 bytes
SHA-256: 49afe1274f15bb5836f22de8ab6742f8c4bbd5becaa39d50a1a7d128e626d11e