Malicious PDF — malware analysis report

Static analysis result for SHA-256 b84d5b514200ae23…

MALICIOUS

PDF

78.0 KB Created: 2021-09-18 16:07:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 534b1fafa9063b84228ff9dce231174c SHA-1: 27ba5892dc1e1055504c48d32c13251d75368a85 SHA-256: b84d5b514200ae237eae8535f0d3a4ba552e45c31b6cfd7c952ad6a1fe52e858
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier. It contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a likely phishing or malware distribution attempt. The PDF structure and embedded URLs suggest it is used to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://catamma.ru/uplcv?utm_term=racing+fever+moto+download+apk PDF link annotation
    • http://rszm88.com/upfolder/e/files/20210918124153.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/3157767267.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/baxokubog.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/mabavilubufafufi.pdfIn PDF document text
    • https://asken.as/bilder/file/7519948258.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/salafuriwixexef.pdfIn PDF document text
    • http://dmkaudit.sk/101/upload/file/xizerumiminikirefanip.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/25243454980.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/perogovu.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/98357221764.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/dupebivo.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/19947292371.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/toxamasirosili.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/bofin.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/33892795631.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/mewugekesokug.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/rimifikekagefu.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/70686147605.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/juzokuzutuwo.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/romapajajemo.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/bopufofeso.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/kudijadajoborurajukuwod.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/zukupelakujamixakop.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/56461157433.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_off0000cca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B7 17096 bytes
SHA-256: 2d4ffd6a76eeaf123dbfc2f08b762cf6d850f98d5997eb3b496b46661d796c79
font_02_sfnt_off000110ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AB 11084 bytes
SHA-256: 8fe04a4f3f52d1f9e583edaa3bc2d1de546160faf38dd268640b54d72715ab01

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