Malicious PDF — malware analysis report

Static analysis result for SHA-256 18e273b0c1ba6e24…

MALICIOUS

PDF

73.2 KB Created: 2021-04-12 07:15:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f85fef66948deaa59eddb5a02cc47eef SHA-1: 6e5d281b687eb63a7b1fc9f2c0733f4f3d701bf5 SHA-256: 18e273b0c1ba6e24e51d473bffaa4768bb62bb5e14681ecbbd435b2eda0df7bb
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to suspicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded URLs and the PDF structure suggest an attempt to trick users into downloading malicious content or visiting a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/strik?utm_term=msi+h81m-p33+drivers+windows+10
    • http://nalodorepuwag.getenjoyment.net/tazivejuvexujesuzowevogo.pdf
    • http://redirerer.medianewsonline.com/how_to_find_mean_of_frequency_table_on_calculator.pdf
    • https://sepuzudagek.weebly.com/uploads/1/3/5/3/135329554/depexa_sudogisa_pifubuno_wazidunovasuwi.pdf
    • http://delinapod.mypressonline.com/24378922958.pdf
    • https://cdn.sqhk.co/zodavujera/ge7igia/auditoria_informatica_piattini_gratis.pdf
    • http://nemagufi.mywebcommunity.org/cambridge_fce_exam_sample_papers.pdf
    • https://cdn.sqhk.co/pododefakes/o075nGi/cold_blooded_love_song_pagalworld.pdf
    • https://static.s123-cdn-static.com/uploads/4367635/normal_6001da45bfb4d.pdf
    • https://cdn.sqhk.co/gutevazito/cN7tiiT/8896614394.pdf
    • https://cdn.sqhk.co/buganixezu/2jhWODd/mobile_battery_charging_app.pdf
    • https://cdn.sqhk.co/jagojixego/gibPagi/entergy_new_orleans_customer_service_number.pdf
    • https://static.s123-cdn-static.com/uploads/4471971/normal_5fed669d8f5dc.pdf
    • https://cdn-cms.f-static.net/uploads/4372963/normal_604ba7d161ed5.pdf
    • https://cdn.sqhk.co/purilusevike/jiWUO0g/44600967452.pdf
    • http://nemosixumeki.mypressonline.com/sifusekujetudemiwelolig.pdf
    • https://wulapoledonuker.weebly.com/uploads/1/3/2/6/132695240/28cd1.pdf
    • https://static.s123-cdn-static.com/uploads/4486042/normal_6002acef80858.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c0cc2801-82d1-4d61-b00c-8ed9bf905860/nizufuwemumanawezu.pdf
    • https://uploads.strikinglycdn.com/files/b99e32a3-98d7-48ee-9c56-2861db517791/spanish_new_testament_bibles_in_bulk.pdf
    • https://uploads.strikinglycdn.com/files/5742a938-2ed8-4383-a1b9-4c1caa1f820a/start_jupyter_notebook_windows_command_line.pdf
    • https://uploads.strikinglycdn.com/files/4316418d-2e2e-4a06-b03c-9cc4e9651539/61927192283.pdf
    • https://uploads.strikinglycdn.com/files/3360c97a-053e-4707-87f2-d2b26c090db6/click_clack_moo_activities.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_off0000ddca.bin
f00d83c3564d8a94ce876779ae7d511272e5ef900a95028e151ca9c669abffe8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCA 5696 bytes
font_01_sfnt_off0000f137.bin
7420714f715d9a07292577d9fec3966aa06219d999e7f062c0f29ce007baeef8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF137 10824 bytes

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