Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc389d7d65eabd35…

MALICIOUS

PDF

77.2 KB Created: 2021-03-30 17:23:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: fbf3e419a5c8016160fe742e377409d3 SHA-1: 7c8200daeb1f365b1c7cfd3be43199da4aa4065c SHA-256: dc389d7d65eabd35402c51e8cb2f6325e3801a49640ef8be33c07ebdf78a5186
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojanized document. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain that appears to be part of a link farm designed to redirect users. The document body, though heavily obfuscated, contains text related to search results, suggesting a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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/aws?utm_term=recon+ron+pullup+program+results PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379032/normal_5fd779f7e4333.pdfIn PDF document text
    • http://obsluzhivanie-kompyuterov.moscow/327358653716b8le.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405899/normal_60190957277bf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474223/normal_5fe3a119ccd83.pdfIn PDF document text
    • http://rejorevubirobu.sportsontheweb.net/catfish_farming_in_the_philippines.pdfIn PDF document text
    • http://sodahub.pro/logitech_mk330_unifying_receiverqcg17.pdfIn PDF document text
    • http://gerujidubona.iblogger.org/jebuguda.pdfIn PDF document text
    • http://mumijivamivaxij.medianewsonline.com/how_to_turn_off_descale_on_cuisinart.pdfIn PDF document text
    • http://mavafesumej.medianewsonline.com/equivalent_fractions_grade_4.pdfIn PDF document text
    • http://xaludilurasos.iblogger.org/ranusugaletovireti.pdfIn PDF document text
    • http://wopedejani.iblogger.org/directorio_industria_alimentaria_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jigebujopa.rf.gd/62695126506.pdfIn PDF document text
    • https://c931c956-7f53-4e4e-96dc-27d7f003ba63.filesusr.com/ugd/b80c10_080d57eeaa8d4cab888f8e11662bc098.pdf?index=trueIn PDF document text
    • https://eee7329a-c4d5-4508-a8fd-a8ba515f7d9f.filesusr.com/ugd/5ed802_956162b3f8194bf898ae5bb77b6092de.pdf?index=trueIn PDF document text
    • http://muweluboxakok.rf.gd/3000534517.pdfIn PDF document text
    • http://rojaxenutu.rf.gd/xupejitor.pdfIn PDF document text
    • https://ac734925-007a-49fa-9a6b-2340142042ec.filesusr.com/ugd/ea78e0_4d8ad995979d47fe8c0670e6464174cc.pdf?index=trueIn PDF document text
    • http://nedudumitariz.epizy.com/aprender_a_leer_partituras_de_guitarra_acustica.pdfIn PDF document text
    • http://vekimawo.rf.gd/sofipidesepiti.pdfIn PDF document text
    • http://kipejefanowisu.atwebpages.com/sosiologi_auguste_comte.pdfIn PDF document text
    • http://tiwojojerat.rf.gd/folisewobubibi.pdfIn PDF document text
    • https://9fd063f5-a6e2-47f0-a1c8-15c646e36cc9.filesusr.com/ugd/ee11ea_de0f7768f1a542058a8eef0bf9a73d0e.pdf?index=trueIn PDF document text
    • http://vorisenunajix.myartsonline.com/samsung_galaxy_s5_mini_max_sd_card_size.pdfIn PDF document text
    • https://85fc0914-20e3-4f1c-be8c-de7e6f89f47e.filesusr.com/ugd/a44510_47fa6d0ec8fb4321a15bb36690e72509.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF028 5260 bytes
SHA-256: 4bd6e3044b2ab18395c832880990ecb4e894ee8935a313275ca3a57cf312c412
font_01_sfnt_off000101f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F9 10492 bytes
SHA-256: 6f7fe4149115949e3c41c719163e1bfbb2aa88fd3fe29707db50546a1d17bfed

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