Malicious PDF — malware analysis report

Static analysis result for SHA-256 280ea853c55a842c…

MALICIOUS

PDF

80.6 KB Created: 2021-10-18 17:15:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f3b7c4ea5e24f6909bac830810550b93 SHA-1: 40695d53fbb7e5aa10a8c58ec705891e0c0ffbbd SHA-256: 280ea853c55a842ca669101953f67cbb5e69c08c15e7eee39fd95a53bcbbb80a
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to malicious sites. Heuristics like 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' confirm its malicious nature, with the 'SE_INVOICE_LURE' suggesting a phishing pretext. The embedded JavaScript is likely used to facilitate the redirection or download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://effekt-film.de/files/file/vazokopegezokamejovije.pdf In PDF document text
    • https://smartcrm.cloud/upload/files/49314571639.pdfIn PDF document text
    • http://www.slappedtogether.com/editoruploadfiles/file/luditabitepudinoko.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/55855609332.pdfIn PDF document text
    • https://frutalmente.pt/site/upload/file/fetuzuxuwekawisedusiwu.pdfIn PDF document text
    • http://www.farimar.pt/imgs/uploads/geseva.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/posopapelemi.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/pigamukodojew.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/lulorumek.pdfIn PDF document text
    • http://norrlandet.se/userfiles/file/91674854853.pdfIn PDF document text
    • https://equipelec.fr/ckfinder/userfiles/files/71913697722.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/3234478567.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/36001385252.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/wumedijidulosusuxevepurob.pdfIn PDF document text
    • https://akemi.ro/hirek/file/jumawikifukej.pdfIn PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/nitede.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/32959571474.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/sixubop.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/95404331918.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/1545946320.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/39502776565.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16155e9b198401---41095321784.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/fadezujunemifafanojubaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/KGDyd8lM0uI/uplcv?utm_term=current+health+policy+of+ethiopia+pdfPDF 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_off0000d4dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DD 17992 bytes
SHA-256: 90927db97f740ab5a7a413f2218376888cc3113fa00c98b21dd0576a794d5625
font_01_sfnt_off000103fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C11 10796 bytes
SHA-256: 77a79a26c85b7a955cb29df029cda006e312eaa44f694aa402e5a09aba10d0cb