Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4bf258aa5caa78e…

MALICIOUS

PDF

73.2 KB Created: 2021-09-30 19:20:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0e4be8b1311ac559789fd68bfe6f7932 SHA-1: dc4b7cb00cf3022d350099c6368e3c1ee9ea56d0 SHA-256: f4bf258aa5caa78e05211c9ccd2668eb21036f16ad83cf61f4aeab6b9fc74ff7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://tubelessons.net/cms_images/file/jebivuxafusijutorubi.pdf In PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/14377765431.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/vanorilomowudexiga.pdfIn PDF document text
    • https://healthtecindia.com/userfiles/file/46406039478.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/fezajumatolemovo.pdfIn PDF document text
    • http://elektro-galerie-hamburg.de/userfiles/file/94981320907.pdfIn PDF document text
    • https://phongkhamtamthan.net/uploadeditor/files/pomowovonox.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210923163610.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/29588059980.pdfIn PDF document text
    • https://dortmundpools.com/contents/files/wotikixonibeta.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/wugazoneviragagawimarad.pdfIn PDF document text
    • http://www.plan.msu.ac.th/ckfinder/userfiles/files/21764925693.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/72825803370.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/32678930956.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/91450633049.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161437b7b3f8aa---gosawumadilakajuko.pdfIn PDF document text
    • http://milkexim.ru/imgeditor/file/20879275739.pdfIn PDF document text
    • https://dm288.rs/slicice/file/47870678923.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/81145126455.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/sakileweduxefisujubevivu.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/gajinod.pdfIn PDF document text
    • https://penzehir.com/dorceiys/ckfinder/userfiles/files/foratupebajatonagotupab.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/79946969893.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/11704559247.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/venubezofejomopeni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+select+all+pictures+on+macPDF 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_off0000b65b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB65B 18940 bytes
SHA-256: d69e37d0a02df8c8b7caaa817de4f15f0c00acf1f4fae467dffcd7a4a6c9411f
font_01_sfnt_off0000e681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE681 10712 bytes
SHA-256: 06dc97bdf7aa95c0dc791217e564c0ee8d31141f02387a6980b99d3136211bdf
font_02_sfnt_off0000ff20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1