Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1171fdaeedd8989…

MALICIOUS

PDF

67.8 KB Created: 2020-11-10 03:39:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 937f3544c13f048026b8238102acfcc0 SHA-1: efc758f2f25b8347e5ebc4a154e6b8ac389a1925 SHA-256: c1171fdaeedd89896ee025c0ecf2a6e821e84075f58259138bd78089c6345b86
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to known malicious redirector infrastructure and a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ggtraff.ru/strik?keyword=terminator+movies+in+order+2019 In PDF document text
    • https://nufirejibojo.weebly.com/uploads/1/3/4/6/134645492/9448291.pdfIn PDF document text
    • https://mojivimimujovo.weebly.com/uploads/1/3/0/8/130874437/xefafimofaxeparekuji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378155/normal_5f90491580546.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421062/normal_5fa9d75120193.pdfIn PDF document text
    • https://riwisasivituw.weebly.com/uploads/1/3/1/0/131070703/52c71.pdfIn PDF document text
    • https://finijuzado.weebly.com/uploads/1/3/4/4/134444754/562c5d8a.pdfIn PDF document text
    • https://dofazodasi.weebly.com/uploads/1/3/0/8/130873943/libor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/649b9d17-0d45-409f-95fd-5b33436d4baa/movie_hd_premium_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c67ece5-bc8f-4fea-869b-8a5cbac915ae/gerund_infinitive_alan_fiiller_listesi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1661aa27-ba24-4cf3-a7e8-f707c3db139c/zesofolasofutif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c6af2c5-45ca-46a6-b258-44a726c34802/mobdro_tv_guide_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47380707-0d93-40e3-94ff-f1db91ad2e7b/93085197911.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc8bfed9-5ac4-4304-9473-c91131fc8beb/nizaxazudasusodirutoxubu.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_off0000cb23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB23 5432 bytes
SHA-256: 588e85c316aeb4d054ccf70a0cbcaba51073f6d3aa943e2053fa9c1dac63a467
font_01_sfnt_off0000dd83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD83 10748 bytes
SHA-256: 338beb1385a52acd1d928057fb2eed5d06a7a19cbb46569002f63fc4be7f86b2

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