Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c7c38943fe95e2a…

MALICIOUS

PDF

73.7 KB Created: 2021-05-08 01:50:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: e1c08095bd519015e0e0956f4e00ee1f SHA-1: 27117581d81cbb143a27306750eba37297c7b044 SHA-256: 1c7c38943fe95e2a2e9a474abd7fb4afa533a628ddcf86bcd3a0874dc2c2ee30
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The document contains numerous embedded URLs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the link farm heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://druttle.ru/strik?utm_term=acer+aspire+8930g+power+jack+replacement PDF link annotation
    • http://dosijefa.mypressonline.com/bon_de_livraison_et_facture.pdfIn PDF document text
    • http://waferaboteb.mypressonline.com/kopaseviliwumi.pdfIn PDF document text
    • http://jutidewolojura.mypressonline.com/back_pain_exercises_nhs.pdfIn PDF document text
    • https://bimuwalunamen.weebly.com/uploads/1/3/1/3/131384226/fe4d65.pdfIn PDF document text
    • http://xumupizaxuto.scienceontheweb.net/23356376392.pdfIn PDF document text
    • http://julugemuzejib.22web.org/31910729545.pdfIn PDF document text
    • http://wanididezaj.getenjoyment.net/ferienplan_baden_wrttemberg.pdfIn PDF document text
    • http://zujejilolo.scienceontheweb.net/99991894360.pdfIn PDF document text
    • http://fizarumokugafu.mywebcommunity.org/autocad_underlay_to_lines.pdfIn PDF document text
    • https://nabezaxe.weebly.com/uploads/1/3/4/8/134852032/77eab1eca.pdfIn PDF document text
    • http://motarojetox.sportsontheweb.net/71080649624.pdfIn PDF document text
    • https://fixizogi.weebly.com/uploads/1/3/5/9/135959929/xojanega-lotipe.pdfIn PDF document text
    • http://zomoxoxuriw.mypressonline.com/74261878493.pdfIn PDF document text
    • http://taxokijoba.sportsontheweb.net/why_is_my_admiral_dryer_not_heating.pdfIn PDF document text
    • http://zigoramad.iblogger.org/best_way_to_pass_network_exam.pdfIn PDF document text
    • http://matawobedopikam.mywebcommunity.org/555188665.pdfIn PDF document text
    • http://potuxoposutu.medianewsonline.com/ball_bearing_failure_analysis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://reladefuxuna.onlinewebshop.net/16728227118.pdfIn PDF document text
    • http://fazegujopazoj.atwebpages.com/history_of_english_literature_by_b_r_malik_book.pdfIn PDF document text
    • http://resilasijajatil.myartsonline.com/nanugokus.pdfIn PDF document text
    • http://komukofebanukev.rf.gd/rifupiwefifosigazovowirof.pdfIn PDF document text
    • http://tokiziguvavu.rf.gd/fording_river_mine_technical_report.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_off0000df29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF29 6128 bytes
SHA-256: 5aebd83b6637bcd6fcead84e019a669ae37cd180c1eac1ca05c94caf89561d8e
font_01_sfnt_off0000f404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF404 11020 bytes
SHA-256: ae9946f2092fa1c65f16d64e31587f124de4c67c64001b01c0033e46c7d680ed

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