Malicious PDF — malware analysis report

Static analysis result for SHA-256 3319df9f39073ef8…

MALICIOUS

PDF

83.3 KB Created: 2021-09-23 05:16:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 585174b0bba3c2817238536b9681c905 SHA-1: d6a7bd24b69135ace7a0a7363bdd2775161c91d0 SHA-256: 3319df9f39073ef88301601c216a3ba2a66978c900346de5a7a8c84271828f9f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external PDF files, many of which are hosted on disposable domains, suggesting a link farm designed to obscure the true malicious destination. The presence of a 'download' button heuristic further supports the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 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.
  • 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 http://npi-management.com/ressource/site-image/files/nigigolepowejolizagen.pdf In PDF document text
    • https://kapokcmassage.com/uploads/files/202109020043351230.pdfIn PDF document text
    • http://synhbio.com/upload/files/kirokafatejevipagabago.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/27478242219.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/86615192085.pdfIn PDF document text
    • https://servauto.fr/img/user/file/23017158235.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/komavikizilube.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/suvude.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/50401475301.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/foxexawebar.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/25559702329.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/piropuvi.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///66952387437.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/nibomutaju.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/83092754924.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/62731809088.pdfIn PDF document text
    • http://garmaclima.com/uploads/ckfinder/files/99702483000.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/65059971179.pdfIn PDF document text
    • https://aurorahoian.com/app/webroot/upload/files/22066184906.pdfIn PDF document text
    • https://greenboo.vn/uploads/files/75123869008.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16140cd95e2938---54162664474.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/42629888400.pdfIn PDF document text
    • https://ptogel2.com/contents/files/xometuduwodakovosonewoto.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/lawukivogigavubepa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=wrong+turn+3+full+movie+free+downloadPDF 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_off0000e15d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF974 10944 bytes
SHA-256: c94120307fff960e721f92222f8fd8c59d0e0c77d51dbd50b9e0ed7b1ecf46ab
font_02_sfnt_off000112b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B2 17224 bytes
SHA-256: 0c8befb5b47b574d0dc2c423ef8567c56d30d11e30e451138c2e197046ad7def