Malicious PDF — malware analysis report

Static analysis result for SHA-256 922d8140b2af0880…

MALICIOUS

PDF

92.9 KB Created: 2021-04-09 23:05:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b6db851068796d15816522a683ca2b8 SHA-1: 34305f1e8a05c6b1ee063f711bf2f6d783f763c4 SHA-256: 922d8140b2af0880f18328e8754e2efef67cd0616512f96e28bab8dc0530014f
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojanized document. It contains multiple embedded URLs, with a primary suspicious URL pointing to a site that appears to be a link farm designed to redirect users. The document body, though heavily obfuscated, contains text related to 'arterial blood gas analysis slideshare', likely a lure to entice clicks on the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://resalured.ru/strik?utm_term=arterial+blood+gas+analysis+slideshare
    • http://milanomodaitaly.site/62656216841ll3i4.pdf
    • http://distornyup.site/jexexozufiwovaguf7id7x.pdf
    • http://kagotigidiwijar.iblogger.org/26279773147.pdf
    • http://montana-media.com/google_search_operators_image_sizerujw5.pdf
    • http://zoompol.xyz/scom_installation_guidesqxt0.pdf
    • http://lnstagramcopyrightcenter.com/bible_coloring_book8zb5n.pdf
    • http://buyervannakupitvsem.xyz/95982345246u5l03.pdf
    • http://zdorovie-vashe-vse.xyz/ravinipodajinm1srd.pdf
    • http://pmaider.com/how_much_horsepower_does_a_tesla_model_3_long_range_have8itbs.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/gudukupir/naruto_blazing_mod_apk_2._17_2.pdf
    • http://welavozolin.rf.gd/cat_s_cradle_kurt_vonnegut_free.pdf
    • https://s3.amazonaws.com/tetenifeme/peace_like_a_river_summary.pdf
    • https://uploads.strikinglycdn.com/files/ca37b024-33c4-473c-9d77-42b2e237b27d/kipufoxusaxapipa.pdf
    • http://zapofekeba.rf.gd/alphabetical_list_calories_in_food_chart.pdf
    • https://s3.amazonaws.com/wurivuve/24147589002.pdf
    • http://kikodanaso.epizy.com/yellow_submarine_filme_dublado.pdf
    • http://lozijuxul.rf.gd/amitriptilina_bula_profissional.pdf
    • https://uploads.strikinglycdn.com/files/7d11d894-8296-4fb9-8ec2-04d551648f5a/43437003457.pdf
    • https://cf336f9a-6a79-4542-9269-5b62d6eb69dd.filesusr.com/ugd/1daf83_f8bef4d70b1c420086fe0cc1e122dfde.pdf?index=true
    • https://5f1c1209-45f6-45c0-988a-e0aaa04be055.filesusr.com/ugd/ba5820_298ed37afdb84506b58aa2e3f4c8a5e9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/29bb6c5d-022f-4142-bb37-aa713265000a/52903781242.pdf
    • https://uploads.strikinglycdn.com/files/300f0f54-dda9-4e5c-bda0-8411b4810365/rezavuxezuwivojabixexaxeb.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011169.bin
2dcf0dab03636905b5321fd66140ae0e63456f2b496a4f8d16ae7fa01b2513fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11169 3372 bytes
font_01_sfnt_off00011ed7.bin
eb8276f85d8606bb6a2bb16f0c291e50fd81602caa826ce6bc211959f3b422f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED7 5104 bytes
font_02_sfnt_off00013023.bin
90e5741997b0283599bc170e5c677be6fe31eb10eeccf42e0018a9fd3cc267fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13023 11468 bytes
font_03_sfnt_off0001573f.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1573F 4324 bytes

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