Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4bea8d683e3387d…

MALICIOUS

PDF

90.3 KB Created: 2021-09-22 13:57:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 916f7f723d5b453f16a4ba7729579121 SHA-1: 7e84372510d94bf232844bd8655ffec9c5651350 SHA-256: c4bea8d683e3387d1e5ab47b47db8cc9b294c12958eb3673a701fccca726063f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to host malicious content or redirect users. The presence of PDF-specific heuristics like PDF_SEO_DISPOSABLE_LINK_FARM further supports this. No scripts were extracted, but the overall structure and heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://kaupa.cz/userfiles/file/77976423613.pdf In PDF document text
    • http://nusratali.com/userfiles/files/juxotosojaletop.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/butenejugugenojor.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/1a902777d09cd9fac3df8ba4b3cdd515/tizuwerabewobudo.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/finetizodijepagitusuluven.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/pefepup.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/65193232694.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/sanusowirura.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/gimegafi.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/50662166795.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28340861307.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/66665924630.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/6795415989.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/161463ff417fb5---fakemojev.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/sexafixegopoje.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/xuxanovul.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/93191419879.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/53869899755.pdfIn PDF document text
    • https://valuekare.com/ckfinder/userfiles/files/19436520765.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/70099585571.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/sowupojudujekabaz.pdfIn PDF document text
    • https://bak.vn/upload/files/pasodikonamika.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/19145262275.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=is+down+a+prepositionPDF link annotation
    • 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_off0000f8a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A9 19600 bytes
SHA-256: b0ddef05ea7077e1ac9ea7a9c4e6b38128cc8de0ebdf6350802524c3bdafb2a5
font_01_sfnt_off00012bfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BFA 10376 bytes
SHA-256: 95329960bf3b9adeab00412543b530498b6000db918bdcc655a801596907e9ea
font_02_sfnt_off0001439c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1439C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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