Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1850b0620aa9c57…

MALICIOUS

PDF

80.1 KB Created: 2021-03-01 04:16:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 1a5ae10bcdb18d38c13d5a383b187183 SHA-1: 50cefa841d669389c5d5c5b03aa6595360ebc530 SHA-256: c1850b0620aa9c5773a19c8bf1a9671ef8f66c917f8dbb2838ee844618d0ba21
164 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wix?keyword=powder+game+2+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4424361/normal_5fd979c27fcf5.pdfIn PDF document text
    • https://cdn.sqhk.co/xedomobedusi/Uhd1jd9/kuwabedafiwux.pdfIn PDF document text
    • https://nozoporunetub.weebly.com/uploads/1/3/0/8/130814805/c1999ca7248c3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476567/normal_5fca213739536.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378834/normal_60356e1a29a94.pdfIn PDF document text
    • https://cdn.sqhk.co/bamazaludez/iephajh/32575541031.pdfIn PDF document text
    • https://wonumajogo.weebly.com/uploads/1/3/1/3/131379434/tijowidu-jitezusejoz-zolafo.pdfIn PDF document text
    • https://katalajoguv.weebly.com/uploads/1/3/2/7/132740778/kizigepowodexab.pdfIn PDF document text
    • https://totakolexab.weebly.com/uploads/1/3/5/3/135391630/sopuso.pdfIn PDF document text
    • https://cdn.sqhk.co/nukunudakiju/gRc6pmT/movistar_plus_gratis_smart_tv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386334/normal_60081d59c7539.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/psd_bifold_brochure_mockup_template.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/wivufarijijexuniginuferu.pdfIn PDF document text
    • https://s3.amazonaws.com/fixararololu/duboboxoseledepu.pdfIn PDF document text
    • https://s3.amazonaws.com/fasudikek/wimudutowatunulajexevono.pdfIn PDF document text
    • http://lafasusatar.rf.gd/guided_reading_inference_activities_ks1.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_off0000ee95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE95 3432 bytes
SHA-256: b2690045af34a0e612f83123f3100eb595393599f11f9d2c76afa6ff86885771
font_01_sfnt_off0000fad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD2 5356 bytes
SHA-256: 4e992bbd862bb59f13618210ea72655441735308d01769df066daa196e4c7067
font_02_sfnt_off00010d0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0C 11196 bytes
SHA-256: bd406ee9e64412fa8b4ddc3eaf36f9d9483b36cccb7261145a7174e636be7439

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