Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c780a6cf8465b5d…

MALICIOUS

PDF

76.8 KB Created: 2021-03-05 19:20:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 96971b651875d64694a220246beb1944 SHA-1: 9d21ce4d7c9bf4344af3db3eb8065c047f7fc3d7 SHA-256: 9c780a6cf8465b5d6f0a9522a41b79fb6ad19a5ac5452e90b108dc1213a9e7fe
126 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains keywords related to 'Brinks home security systems cost', indicating a lure to entice users to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://kuzutuzo.ru/aws?utm_term=brinks+home+security+systems+cost PDF link annotation
    • https://cdn.sqhk.co/lexijunibul/iggvgjK/38615669135.pdfIn PDF document text
    • http://hot-money.fun/what_is_360_degree_leadership_assessmentxsdxq.pdfIn PDF document text
    • https://cdn.sqhk.co/besogevipadi/niiUigu/notes_notes_and_lists_photos.pdfIn PDF document text
    • http://timinome.getenjoyment.net/xefuzewumulukoniwidunoki.pdfIn PDF document text
    • https://pibusabet.weebly.com/uploads/1/3/4/6/134695111/e0ceced74bd2.pdfIn PDF document text
    • http://junumidutuzakox.getenjoyment.net/2005_honda_odyssey_misfire_problems.pdfIn PDF document text
    • http://fishing-rods2.club/pyromancer_dark_souls_1_guidel7dua.pdfIn PDF document text
    • http://sakulog.sportsontheweb.net/audiocodes_mp-114_manual.pdfIn PDF document text
    • http://fufejezonodim.mywebcommunity.org/how_to_hold_and_swing_a_baseball_bat.pdfIn PDF document text
    • http://vknacruckalaikov123.xyz/621086545719xj9p.pdfIn PDF document text
    • https://pikimitif.weebly.com/uploads/1/3/3/9/133997727/4548171.pdfIn PDF document text
    • https://cdn.sqhk.co/walamalesumi/djdjhij/walking_dead_movie_release_date.pdfIn PDF document text
    • http://sks-expertiza.ru/377412518474lhh9.pdfIn PDF document text
    • https://cdn.sqhk.co/wemorapi/bgjExKB/ulala_idle_adventure_pc.pdfIn PDF document text
    • https://vitovoraf.weebly.com/uploads/1/3/1/1/131164311/9157d.pdfIn PDF document text
    • http://begdas.fun/how_to_handle_stress_at_work_interview_questionyphpy.pdfIn PDF document text
    • https://cdn.sqhk.co/gutifusuf/d0gehHh/varemed.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://40ba1f7a-6e91-49bb-bbb8-dfbb40a2bc60.filesusr.com/ugd/22bf55_46bb36f59c0e4742ae914ad34c3137e7.pdf?index=trueIn PDF document text
    • https://441dbedc-201a-49d7-bb2a-292980023e2b.filesusr.com/ugd/473728_92494cbc03cc4f7ebe15863677c9ab5b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9de0a8b-2384-4705-82a2-1905358b4652/jojononorivesatibuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4771bab-c053-4aaf-9dca-3b65c842b853/8229252987.pdfIn PDF document text
    • http://nununad.myartsonline.com/the_life_we_bury.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/690e143c-e232-41c7-8eae-51124fe3d94b/94232462874.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_off0000f087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF087 5012 bytes
SHA-256: 64e2806339d5b94578d20b07a1a2900ee357170bb15b1b54af12c1e971179d5f
font_01_sfnt_off00010178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10178 10632 bytes
SHA-256: c16d92c12166c5f314f18f595db77a7090d4063db0ea8a361eafcc95ea5d488b

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