Malicious PDF — malware analysis report

Static analysis result for SHA-256 cba24139c5ebe1bd…

MALICIOUS

PDF

79.9 KB Created: 2021-03-19 14:53:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27e8c762f7808b0bb35ff490de8ed8fa SHA-1: 2110ff29bde4e0e2384066eeb2139f107c2dc79e SHA-256: cba24139c5ebe1bd12bf7a63c17a793f66132ccd84c4691af6073342eb905ba1
126 Risk Score

Malware Insights

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

The PDF document is detected as malicious by ML classifiers and ClamAV, indicating a phishing attempt. It contains numerous external URLs, with one specifically disguised as 'netapp storage interview questions and answers pdf' to entice clicks. The presence of embedded URLs and the overall structure suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://baarspo.ru/123?utm_term=netapp+storage+interview+questions+and+answers+pdf
    • http://vowewudimo.mypressonline.com/49998258208.pdf
    • http://copyrightsupporthelpcenter.com/blender_2._79_bagas31dprhh.pdf
    • http://kafidovomiguvo.mywebcommunity.org/to_do_list_for_seniors_in_high_school.pdf
    • https://cdn.sqhk.co/ragojagef/hggchdL/46562507812.pdf
    • https://cdn.sqhk.co/remimidotomi/dif2jcp/wusijexidomobarukunumis.pdf
    • http://pubgmobiie.com/685764769722k8ep.pdf
    • http://wersita.fun/397087738644bb20.pdf
    • http://woxijakuzadajew.getenjoyment.net/jikaja.pdf
    • https://cdn.sqhk.co/folikulezig/v1Hgjhg/business_administration_degree_jobs_san_diego.pdf
    • http://najisemure.medianewsonline.com/26303261777.pdf
    • http://riwotivadejud.sportsontheweb.net/93789449111.pdf
    • https://cdn.sqhk.co/vadezewe/YYpgchc/kizokerutelesad.pdf
    • http://kolagozisil.mywebcommunity.org/vapokugameda.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://12a3aa02-022d-4218-8efb-90aa4388683d.filesusr.com/ugd/6dfd9b_00107c9234a44728ae6d3889de25f756.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f2c990e0-a52f-45d5-8e35-31d05d0872a9/garmin_920xt_reset.pdf
    • http://wugerubuvugox.myartsonline.com/remove_blank_page_in_java.pdf
    • https://uploads.strikinglycdn.com/files/7f9356dc-9dbf-42f8-9e4d-1fa6f69dd99e/vapibisogipew.pdf
    • https://a21f0d7d-5fe0-4a99-a381-3b18266e0880.filesusr.com/ugd/6c313a_42485b7b7ed74d329eeddd01e3c7f5a4.pdf?index=true
    • https://a7da3e60-63c8-46c1-a846-eab7df628ed2.filesusr.com/ugd/bba345_c51676dc483b47ff8c039432ea52c48e.pdf?index=true
    • http://pekowob.onlinewebshop.net/hi_standard_sport_king_serial_number_lookup.pdf
    • http://sogoxutagejuno.atwebpages.com/nafame.pdf
    • https://uploads.strikinglycdn.com/files/e40ac750-738e-45c6-be51-fb3df5f8803b/sonic_corn_dog_calorie_count.pdf
    • https://c5c27394-2042-4749-9b39-d1c24dcbd9f0.filesusr.com/ugd/e9b987_0c40aecfe7a543a6bd41c9cf6e171482.pdf?index=true
    • 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_off0000fc6b.bin
c212ec1f843a8a5ef0cc64f70b27a8a9c66dbc0f571a4d8a0f862f35e5e7f076		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6B 5424 bytes
font_01_sfnt_off00010efe.bin
67949b46381e67aff921bb6a4e2dc8ab9ef9aba0f3fd2bb6bb3717f7de064210		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFE 10592 bytes

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