Malicious PDF — malware analysis report

Static analysis result for SHA-256 9900264cd521a767…

MALICIOUS

PDF

71.3 KB Created: 2021-01-06 08:31:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 495024b441381ae471dc355012ac3edd SHA-1: 79394a9a0bd0780fb1bee65b12d0f4396f9585d7 SHA-256: 9900264cd521a7677e39c74e7a4dc290808629648eaf256a6137c7a18c78d810
214 Risk Score

Malware Insights

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

This PDF file contains a link farm designed to redirect users to malicious websites, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV also flagged this file as malicious. The embedded URLs suggest a phishing or scam attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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
  • 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.
  • 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.
  • 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://traffmen.ru/123?utm_term=sword+art+online+4%253A+fairy+dance In PDF document text
    • https://cdn.sqhk.co/xubulozirod/jicHiDL/add_contacts_widget_to_iphone.pdfIn PDF document text
    • https://zewadozodatigi.weebly.com/uploads/1/3/4/3/134337643/zufasan.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://uploads.strikinglycdn.com/files/34c863ec-ae51-4a4f-9f19-3cdfbd03a09a/ligex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53f8d21d-0354-46e4-9373-d75dcf280967/duxapa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c8aee48-3073-4fa8-bef2-446f98200f51/how_to_reset_a_deathrun_map_in_gmod.pdfIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/44657763938.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9332d74-3a8e-4c39-a7e6-a0510461c12a/tacho_pro_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f98d02cb-9305-449e-a63f-270f3783c839/2d_wrestling_revolution_apk_pro_mod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9cf5c9e-ccf5-4bfb-bf43-2c82c667def2/punapeximifadexof.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEDF 3220 bytes
SHA-256: af443ce705348601f68b197baf710081a466f9d95fb60642de925ad7296036e1
font_01_sfnt_off0000ca53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA53 5060 bytes
SHA-256: e7fe80e9f1da2ea2556e3430e6d5b1ee02e876d2ce159d8d77ac035f96999a85
font_02_sfnt_off0000dbab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAB 11240 bytes
SHA-256: aed4afabca57f9ff0b40f6e88cad76add6c0a7ce381dbac6e80e275a3d3f6606
font_03_sfnt_off0001005c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005C 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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