Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8e504912e7751e4…

MALICIOUS

PDF

71.9 KB Created: 2021-09-11 12:31:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f41d2c824066d122c2216323a99779a0 SHA-1: d1092881c1a0db2ce3c73580f0ca611f49e27efc SHA-256: e8e504912e7751e4d85edfb9362b2538cd2500a63b73db5a0c33d8aac230bf8b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. The PDF contains numerous embedded URLs pointing to other PDFs, suggesting a multi-stage download or redirection scheme. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://hotelgaric.com/upload/datoteke/jivujawemikuxawukabopiv.pdf In PDF document text
    • http://budaors.varosom.hu/userfiles/files/36295805592.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/84566400458.pdfIn PDF document text
    • http://arcadia-fitness.es/userfiles/file/sowagobagopep.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c477688edb---mudikodupabumimupeno.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/nonuxuvudenapasirav.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/9121686560.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/74266203111.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/laluzobegosi.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/lowunujazejisudaraxenu.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/zuxafabaxivofazivoruduma.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/419967308.pdfIn PDF document text
    • https://tl-systems.hu/files/files/devopadanoletiniw.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210907_FCEBAEB298EECEAD.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/molijerorasuverefam.pdfIn PDF document text
    • http://svarovani-tig.cz/userfiles/file/61253328032.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/37064253509.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/toxulisuxatewowagowetowok.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/7458133195.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/xujesumuwimezuzevib.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202109090007000947.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/repamexopuvi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=android+take+photo+programmaticallyPDF 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_off0000b5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5DF 16656 bytes
SHA-256: 1674c2c63af32f106869566530b1a62eb09ff2f0297dcc22b66c1cf17ce55757
font_01_sfnt_off0000e127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE127 10980 bytes
SHA-256: bbe17b1b60f44684a3a175023185e8b604606d3b2d1d9fbc476efdaa91e418c8
font_02_sfnt_off0000fa3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1