Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5f6790d1d906097…

MALICIOUS

PDF

83.0 KB Created: 2021-03-12 11:46:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ab67893644e5cb28084b63623365973 SHA-1: 171c5d7fa26693f5aa59f203ee89d0f3bca8b784 SHA-256: e5f6790d1d906097f7feaf9a3419ed127684495466ea241f998b55d9a96ea1e4
156 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which appear to be part of a link farm designed to direct users to potentially malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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=how+to+renovate+a+mobile+home+bathroom
    • https://judaromoperojog.weebly.com/uploads/1/3/2/6/132681758/6016070.pdf
    • https://pevunefimexog.weebly.com/uploads/1/3/1/0/131070247/loline_fimek_dozem.pdf
    • http://nibewubixela.getenjoyment.net/firestars_quest_midnight.pdf
    • https://pepedojimu.weebly.com/uploads/1/3/1/0/131069997/509ff.pdf
    • http://dabutaxezopis.iblogger.org/bncc_educao_infantil_homologada.pdf
    • http://ligoturup.22web.org/list_of_words_that_should_not_be_capitalized_in_a_title.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://3a0d5408-2ea1-4258-8d29-5d96341cad2c.filesusr.com/ugd/79cb75_f9a638eded7144118691617127d26f4d.pdf?index=true
    • https://s3.amazonaws.com/zulezov/free_photoshop_book_cover_template.pdf
    • https://2a983b51-2e13-4971-8c1f-a5bca3ab4353.filesusr.com/ugd/e1a791_4a38646fc75b47e984df1c83b9c645f3.pdf?index=true
    • https://c18d7360-3707-4bf1-9d6f-52ba7510fa17.filesusr.com/ugd/76cb06_2fea60693654410897cbf62742868c15.pdf?index=true
    • https://s3.amazonaws.com/dazawojob/android_toolbar_not_showing_title.pdf
    • https://945b3f91-9c76-4178-be32-f0dab3cfe2c6.filesusr.com/ugd/8d5d69_1fb886ee66ef4065be73dbf436aeb61e.pdf?index=true
    • https://835a0401-7144-467e-aacc-710587930ffc.filesusr.com/ugd/432cba_d33eb8f99f564e29b4d7bd57cbff863c.pdf?index=true
    • http://segixiw.epizy.com/princess_jasmine_coloring_pages.pdf
    • https://uploads.strikinglycdn.com/files/f40c9234-5ed0-4b01-b999-9675b635f300/who_can_replace_a_man_literary_analysis_setting.pdf
    • http://nadalapaxizo.epizy.com/dolphin_emulator_apk_free.pdf
    • http://tiluxusimutine.atwebpages.com/83238375998.pdf
    • http://bezopiwuzalobit.rf.gd/balsanskar_marathi.pdf
    • https://uploads.strikinglycdn.com/files/a16fbeeb-f70c-4260-93d4-293388038fd3/97170298178.pdf
    • https://uploads.strikinglycdn.com/files/3656172e-5da2-427b-8f06-076eabe1e697/how_to_add_omnisphere_presets.pdf
    • https://uploads.strikinglycdn.com/files/420e0f26-4d08-43a2-8089-2e18b664d803/titus_andronicus_in_plain_and_simple_english.pdf
    • https://uploads.strikinglycdn.com/files/3e696191-37b2-4e3b-abbf-daaed9fbc6e3/198173639.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc5f.bin
7395c1a94c1be8605aaef5829c1f25940d9a43e00872a278800b9b5a13f2ca2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5F 4788 bytes
font_01_sfnt_off00010c79.bin
d33d883415903b3113736ffd3c15a35c1900f97c470096056aad643051b2e5d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C79 10684 bytes
font_02_sfnt_off0001304c.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1304C 4324 bytes

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