Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2640347fc97ed95…

MALICIOUS

PDF

72.0 KB Created: 2021-10-04 05:30:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 60d357ac31a91f56c612dd08406535cb SHA-1: 01c482c662f88f82301e48af31bdb1a0de857c91 SHA-256: d2640347fc97ed953422713d010e02695cca9b179d21d34596fb05a1c366f03d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used for phishing or distributing further malware. The presence of embedded URLs and the nature of the heuristics strongly suggest it acts as a lure to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://inwebjor.ru/uplcv?utm_term=joules+to+food+calories PDF link annotation
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16144219b5691c---vijubigozir.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/99447388592.pdfIn PDF document text
    • http://samafb.org/uploadfilefiles/nesonikofodel.pdfIn PDF document text
    • http://achwvs.love-mrt.com/upload/files/77099585883.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/19407766533.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/zalinimevirugutufilasipum.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/29121702692.pdfIn PDF document text
    • http://webs123.com/userfiles/file/44110882950.pdfIn PDF document text
    • http://owop.challengersports.com/ckfinder/userfiles/files/11263480413.pdfIn PDF document text
    • http://obkladacstvikolar.com/content/70003822703.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/28161273775.pdfIn PDF document text
    • https://inwestorfinanse.pl/userfiles/file/libikanigonasedezaz.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/gudutev.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/36270380549.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/70426367443.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/33139241577.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/86160489476.pdfIn PDF document text
    • http://mapect.com/upload/fckeditor/file/lixafugu.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/zevuwubanolofitiz.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/misutiwabi.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/97434470129.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_off0000b315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB315 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB27 18492 bytes
SHA-256: 6a6ae52c41cd7a0376d5d53f2421aeb07d18976b4a317fa7ede5c92ec7da0ea7
font_02_sfnt_off0000fa92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA92 10456 bytes
SHA-256: 9718cb81d9a40630617ba5397de673c15bd472741ecf8b0e26e8960c7430e28f

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