Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a37e83ce0c0d676…

MALICIOUS

PDF

98.9 KB Created: 2021-02-20 20:53:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0f2ee1c31ddb7a3239d02a86623e6708 SHA-1: 6d45cb7c27aa4cbdacb388bbf75756493b2b61da SHA-256: 7a37e83ce0c0d67657fa7af7777efbc4b58d9e74cdd0f51f831864144a1573af
154 Risk Score

Malware Insights

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

The PDF file contains embedded links that redirect to a malicious domain, identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing trojan. The document body, though partially corrupted, suggests a lure related to 'Free toefl vocabulary words practice'. The primary IOC is the malicious redirector URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://crophysi.ru/wb?keyword=free%20toefl%20vocabulary%20words%20practice In PDF document text
    • http://zalofamanaw.22web.org/38759398471.pdfIn PDF document text
    • http://vijofogozorumi.22web.org/aligarh_muslim_university_date_sheet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/womirofop/wojiximinipewuliv.pdfIn PDF document text
    • http://figejadinopi.rf.gd/nonprofit_communication_plan_template.pdfIn PDF document text
    • http://tujukiji.rf.gd/jenn_air_stove_repair_near_me.pdfIn PDF document text
    • http://jabelakejirer.epizy.com/1968604718.pdfIn PDF document text
    • http://zigerakujig.rf.gd/88716103837.pdfIn PDF document text
    • https://s3.amazonaws.com/mekonulegipero/deep_impact_movie_free.pdfIn PDF document text
    • http://vasikiga.epizy.com/utorrent_android_incoming_port_0.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/kosujojokovavopuwotosu.pdfIn PDF document text
    • http://nimunofat.epizy.com/amlodipine-_induced_gingival_enlargement_a_case_report.pdfIn PDF document text
    • https://s3.amazonaws.com/runuzitexokol/32244700948.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/mental_health_information_in_vietnamese.pdfIn PDF document text
    • http://vezuzatutuxi.epizy.com/bag_s_groove_lead_sheet.pdfIn PDF document text
    • http://tunawibiga.rf.gd/extraction_of_iron_in_blast_furnace.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000139a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139A9 5276 bytes
SHA-256: 194b37e21d8a5a16321e31bd08cddd415eb2610d8f494c14f2c0416db088802a
font_01_sfnt_off00014bc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BC8 10836 bytes
SHA-256: 12ab138620fcfe2d06c632e4899a30be0da646192d1c01a18c2b60337b1969c6
font_02_sfnt_off00017093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17093 4324 bytes
SHA-256: 781b9fae2fb9201b4a05d2041fea553bb2973f1d011ab9c51e3326c72e342c60

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