Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad7e4eb6fd114f31…

MALICIOUS

PDF

83.6 KB Created: 2021-03-08 22:53:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac9a36ed42a7d74402690c22958217d2 SHA-1: 6325c6ed4e2bc17edfb7900bf9ed1ef7623d42f4 SHA-256: ad7e4eb6fd114f31ba2097f96081c7fe1218b858faf509eb7cbe046787bbbdd3
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to suspicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soxebez.ru/wix?keyword=sales+tax+worksheet+5095
    • http://ruvinowuge.scienceontheweb.net/what_is_reiki_level_1_attunement.pdf
    • https://susafoxepi.weebly.com/uploads/1/3/0/7/130775374/4976808.pdf
    • https://nokesopupikes.weebly.com/uploads/1/3/4/7/134767934/1355710.pdf
    • http://anrostore.ru/firepower_4000_datasheetlzxq5.pdf
    • https://gifolavetufo.weebly.com/uploads/1/3/2/6/132695571/d953456df4e1f.pdf
    • http://myfoxing.online/36205487227rvvai.pdf
    • https://wenezobu.weebly.com/uploads/1/3/4/6/134625155/telowo_pitimidis.pdf
    • http://gasurorir.sportsontheweb.net/what_order_should_i_read_the_expanse.pdf
    • https://wazurewimi.weebly.com/uploads/1/3/4/5/134598950/vaxiwow_tivasorosuwexi_vugeranesub.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/249f4d6b-8872-4121-81a3-8567d9834cf1/how_do_i_know_when_my_dremel_is_charged.pdf
    • https://3d3b31fc-6152-41c7-b1d4-a4af3afcce63.filesusr.com/ugd/3f8d85_1a491a1a1d7e42c98e90324d454a8a42.pdf?index=true
    • http://nibemodida.myartsonline.com/autel_maxiscan_ms309_manual_espaol.pdf
    • https://923a8ca3-316b-4844-b38f-9bc955ad4852.filesusr.com/ugd/312e0e_15ca37bc28fb4b9a9e30a372df4cf3b6.pdf?index=true
    • https://s3.amazonaws.com/vunizi/android_app_icons_play_store.pdf
    • https://s3.amazonaws.com/limewub/42839710520.pdf
    • https://0f926834-650c-4d5a-b53c-ad60ae412ccc.filesusr.com/ugd/6a44d8_5e6fccd563504379be4c6cfdeaea48f4.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6dde0d38-ff01-4158-a1b3-fa33789eff73/kasuxib.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_off0000fc94.bin
88adc4a8a3c0bef53410ad952e2a9412b7b5719de8c3544c48f772fa87a6dce7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC94 5156 bytes
font_01_sfnt_off00010e36.bin
4e68c943c01bb9c3eec43b91c0cd196b7e46622de8ce0913a23375faaad5c46c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E36 11276 bytes
font_02_sfnt_off000133a3.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x133A3 4324 bytes

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