Malicious PDF — malware analysis report

Static analysis result for SHA-256 44566025942ac2b4…

MALICIOUS

PDF

73.5 KB Created: 2021-09-11 23:33:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-12
MD5: 2d61828d69aed3da024bac5fbeae4c91 SHA-1: 9917a4fdfd9dae65f1b3fe7d7b6ebb3cc45b6e90 SHA-256: 44566025942ac2b48581bcdad3041be901cd8c4113cdac0270ab84067e2fd9f7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, with a high-severity heuristic firing for embedded JavaScript. The PDF also contains a large number of external URIs, many of which point to potentially disposable domains, indicating a link farm or redirection scheme. The embedded JavaScript is likely responsible for initiating malicious actions, such as downloading a second-stage payload or redirecting the user to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ncdesign.it/userfiles/files/tudop.pdf In PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/woseti.pdfIn PDF document text
    • http://smirna.pl/files/file/9392958796.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/fefizufupanobotuve.pdfIn PDF document text
    • http://2222.netsociality.com/upload/files/68837301307.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/rumabekisapelelesikol.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/20031429640.pdfIn PDF document text
    • http://domexpo.ru/up/file/4718574615.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/78011674825.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/betapitenolafuz.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/lazenuxagob.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/79773429276.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/nolisisigilovaga.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/rebutibelomolij.pdfIn PDF document text
    • https://lideregitimpaketleri.com/calisma2/files/uploads/jeniwuxozupomoga.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/31994831910.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/kazenanexunabiwutixif.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/26611909355.pdfIn PDF document text
    • http://iscyber.com/userfiles/files/50904521573.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/20967216150.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/88625899216.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=harry+potter+and+the+deathly+hallows+full+moviePDF link annotation
    • https://mediacentre.heathrow.com/js/ckfinder/userfiles/files/81480956633.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_off0000ba17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA17 11120 bytes
SHA-256: 030c95ca8f484f752bac732518b6294ee0048b2f06a04689104d5586e790378e
font_01_sfnt_off0000d3dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DD 17032 bytes
SHA-256: 541a5f37dca322799d8241fe2d514e387675c79793d11bc9c3e35a9fe88b3887
font_02_sfnt_off0001002d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1