Malicious PDF — malware analysis report

Static analysis result for SHA-256 9523f9a8fd05c8cb…

MALICIOUS

PDF

86.0 KB Created: 2021-09-22 22:53:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d0589ab0e5265e44e16116c807deab21 SHA-1: eb1a11264f5c045c65837deabf71ddd36e8c1197 SHA-256: 9523f9a8fd05c8cb2971c8669a87972bad1b95f70a17a5db011c35e75c09f46b
166 Risk Score

Malware Insights

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

The PDF document was identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of an advance-fee scam. It contains numerous external links, many pointing to disposable domains, suggesting an attempt to redirect users to malicious content or phishing pages. The document's structure and heuristic firings strongly indicate a phishing lure for financial fraud.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://infrive.ru/uplcv?utm_term=war+storm+read+online PDF link annotation
    • https://hargagila.com/uploads/image/files/pudemivadod.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/35567176445.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/remusinobaka.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/kukeretisumazizevofa.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/laratulenimixo.pdfIn PDF document text
    • http://marktoby.com/akram/know_news/admin/userfiles/file/84217200165.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/86726144607.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/girufob.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/93454782937.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/93847355307.pdfIn PDF document text
    • http://nghieuphong.com/upload/files/89110332482.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/5a6518893b31ed133c5e2f3a37982dcb/99538709278.pdfIn PDF document text
    • http://sanraimundo.cl/dyn/uploads/file/sepubumamegopafoxa.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/28920526936.pdfIn PDF document text
    • http://patanjali.zohukum.com/ckfinder/userfiles/files/7331351746.pdfIn PDF document text
    • http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/29225600046.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/duvax.pdfIn PDF document text
    • https://xn--49st2et51duvk.com/upload/files/39317378208.pdfIn PDF document text
    • http://bndweb.nl/upload/files/mojetet.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210910024537.pdfIn PDF document text
    • http://szerecsen.hu/editor_up/53105400464.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/74280502380.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///59554958635.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/nizuris.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/gapikidep.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210920_052410.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_off0000ec07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC07 17920 bytes
SHA-256: 8dcc8430e5e0af8a8d425b03b5dbd0e5a322e0b07ae9ae49106e12599d72a456
font_01_sfnt_off00011a8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A5 10404 bytes
SHA-256: 8b0bcc55e87a4c50f40cd5020e37cf8e85f6c7500d212c63487ff86ba65b6f8e