Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdd91cf96a484f34…

MALICIOUS

PDF

79.1 KB Created: 2021-09-17 23:38:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: af28666592669442b4ec561d36ef12b7 SHA-1: 9fb4f628e3355c4a47438fbcc5bcf5e7071b47f3 SHA-256: fdd91cf96a484f34290bc454ecdcdb6629940f69d7da799b566e8f9e9005eb4d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are part of a link farm designed to redirect users to potentially malicious sites, as suggested by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The presence of these redirectors and the nature of the URLs point towards a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://nomylo.ru/uplcv?utm_term=pdf+to+facebook PDF link annotation
    • http://palakkadtourism.in/ckfinder/userfiles/files/puxis.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/ratejigiwanakazo.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/36064714840.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109021424428386.pdfIn PDF document text
    • http://cx-gl.hu/images/files/44097005095.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/sanazexusegez.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/18699186335.pdfIn PDF document text
    • http://hejia-ele.net/upload/68347403762.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5b97f419d---xufolosutovew.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/8521474301.pdfIn PDF document text
    • https://frontivo.ro/userfiles/file/vatuxozefisipebolu.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/bamukufa.pdfIn PDF document text
    • http://brenderup.ro/mm/file/5748522949.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/sasuxefunatakufajasemub.pdfIn PDF document text
    • https://tl-systems.hu/files/files/53413115787.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/mutinosadabenofofojibi.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/68329212773.pdfIn PDF document text
    • http://slavutich-media.ru/userfiles/file/lujerogopumevaredafape.pdfIn PDF document text
    • http://only-svet.ru/upload/files/9415687570.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/62626707513.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/1249966301.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/66804225555.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/8b4cd60fa8e75e66f3d810d98459a6b0/sefawamu.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/xasilu.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_off0000d376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD376 17156 bytes
SHA-256: 0a2596f9387e7ac10db13c2461ff75927d5da7c7c50a3425dbea0b738a2aacb9
font_01_sfnt_off0000ffa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BA 10192 bytes
SHA-256: b5cd5624066a394efacfaa4eab564901143cafc98ea0011f7e816c0d254a2ffb