Malicious PDF — malware analysis report

Static analysis result for SHA-256 12f17fecde253010…

MALICIOUS

PDF

74.0 KB Created: 2021-03-11 02:56:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 0120bbd10423ac690b3319ad65baa0fb SHA-1: 2f0a20a81d476a43efb1a76dd0954d6b952b9e52 SHA-256: 12f17fecde25301039c8087aaca378125f79687b48570866ec83afd6b7b6e1be
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains a significant number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 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.
  • 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://kuzutuzo.ru/wb?keyword=php%20dynamic%20website%20examples PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374185/normal_600c6e6b7fc26.pdfIn PDF document text
    • https://tawedituja.weebly.com/uploads/1/3/4/8/134864040/xopamegubanu.pdfIn PDF document text
    • https://rezezeveg.weebly.com/uploads/1/3/1/8/131871466/5158980.pdfIn PDF document text
    • https://manesufepal.weebly.com/uploads/1/3/1/3/131381078/3347343.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484804/normal_601a22d6a4dea.pdfIn PDF document text
    • https://dowamodugepaxa.weebly.com/uploads/1/3/0/7/130739159/4999448.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384149/normal_6029e36635b01.pdfIn PDF document text
    • https://fopezifu.weebly.com/uploads/1/3/4/7/134717551/3c037d5af796.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474997/normal_5fd857821d65a.pdfIn PDF document text
    • https://togimapobeno.weebly.com/uploads/1/3/4/6/134649298/fe39fa7dac1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420039/normal_601d14ec087b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402951/normal_603abf5a3c7b6.pdfIn PDF document text
    • https://wururozudarorar.weebly.com/uploads/1/3/1/3/131380521/xikubox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379384/normal_6016fec2a3f37.pdfIn PDF document text
    • https://toxofeleziwogiz.weebly.com/uploads/1/3/1/4/131406173/jesujogomufabowana.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472763/normal_6028a1e00f17c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://35e1cc1d-5f6c-4a41-9b1b-b9ae8dddc97a.filesusr.com/ugd/351eee_e84279047d1e4c199f8115ffdab445ff.pdf?index=trueIn PDF document text
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_eee92a7786c240c5a728a08caaeab622.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7887855-4ad7-4653-b143-24178eabc98a/87146002672.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe46d280-1ca4-4f2a-861d-6ac4645ecf48/metric_system_scientific_notation_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc6c86e6-faf1-4537-aa77-94dbd37b598d/bapodija.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f3327e2-4ca9-43dd-b2c8-818de9d6a057/is_tawhid_in_the_quran.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/191b65fc-95c5-434a-bcd5-1ce5d7cbc4f1/24067234695.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A9 5620 bytes
SHA-256: 1fa01ef11c858b3137db91c35f4e2cf41a56555130b09a1d5b1916e42b94977f
font_01_sfnt_off0000f5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B7 10776 bytes
SHA-256: 9011f4d2685a32df1ea4d53485bed10e19f78d33f2f21e6c582a5192ee0bfc29