Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e1cb72f28039904…

MALICIOUS

PDF

83.3 KB Created: 2021-09-21 16:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 26e43996be3796928e759a953c3e725e SHA-1: a086e9d66b7529751839f5e87242e6c2f010cdf4 SHA-256: 4e1cb72f2803990447b60545ef738dca345ed2488a0a7d4a972dc92e450a2bbd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm designed for malicious purposes. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • 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://smidgel.ru/uplcv?utm_term=apps+like+gauthmath PDF link annotation
    • http://chaukitchen.com/uploads/files/83330886505.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/puvumapawaxamisanutibozot.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/58002207037.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/fenakusujomobure.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/migopimovonuwifidapeli.pdfIn PDF document text
    • https://vinaarc.com/app/webroot/files/ckfinder/userfiles/files/vimifagonaga.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/derijazafenuzanutajufa.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/foxazotodazuxi.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/zilar.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/gunumitu.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/fagirafizafezex.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/3150339589.pdfIn PDF document text
    • http://albertf.madteam.net/ckfinder/userfiles/files/pojobakug.pdfIn PDF document text
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/34813161396.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/lugivosarusoxot.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/79925196097.pdfIn PDF document text
    • https://4of100churchstreet.com/assets/media/files/90558863045.pdfIn PDF document text
    • https://ww150004.linebot.net/upfile/files/20210913174957.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/besejojo.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161462d6968fd0---80904542451.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/degaseluderodatajuj.pdfIn PDF document text
    • https://drishtinetcom.in/FCKeditor/file/wajiwobuzoriluliz.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613042967425b---83597165566.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/bevazadojuxabudexalewiz.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/viwewamoxuvawe.pdfIn PDF document text
    • https://www.posluh.hr/ckfinder/userfiles/files/novetuxinu.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE260 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA77 10548 bytes
SHA-256: 45668106d4df44a00b9074b44e8def75b12c38fe47a6c7ec4f62b6e9e3567d8c
font_02_sfnt_off00011291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11291 17344 bytes
SHA-256: a134af1be8f2985a7a86537060cca33808ab9e24cfb65c6f074ec5325580057b