Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa20e476e806e0bf…

MALICIOUS

PDF

71.8 KB Created: 2021-09-13 11:15:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 86ae6bf924ab11d56710b008a7fd32d4 SHA-1: f19a55727a9620cd3e20df3a33d03056ffe0d24e SHA-256: fa20e476e806e0bff721ea3fdacd6e3dd44ee841e2554ff45cd3ccd5b89eacd9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable hosting and employing UTM parameters, suggests a phishing or link-farming scheme. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://laborke.ru/uplcv?utm_term=how+to+know+if+you+have+been+hacked+on+iphone PDF link annotation
    • http://myphamvickwhitebeck.vn/luutru/files/xopefubajijixob.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/lojekejemapodojorekujo.pdfIn PDF document text
    • http://ore-processing.ru/d/files/nemux.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/9287466071.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/198572d2b6fb22f74cf0aabb479dea38/xifuxumebaz.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/mapedu.pdfIn PDF document text
    • http://syekp.gr/sites/default/files/file/37438776465.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/gapizadanegagowivageluwe.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/lovisoxu.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/69478617455.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/1b7936723143f3c35bd3018bda90b17f/71837100720.pdfIn PDF document text
    • https://interconformity.ro/images/file/golidifetavos.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/tewezofigavo.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/10654831142.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/simofem.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613599541b6ee---wakavewufijixidazabaruz.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/foseg.pdfIn PDF document text
    • http://noithatlekhanh.com/Images_upload/files/losivimi.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/jafokuler.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/rexajuxoruxo.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/vuruf.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/mipale.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/70524195062.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_off0000ba0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA0A 15024 bytes
SHA-256: 553f1ab801face4cfa36e4968784eba3cbf1457343c994a3bccc6ed3f90e689c
font_01_sfnt_off0000dfdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F6 10992 bytes
SHA-256: 23713c7f53effde7c2f1365fa8cdf761f0b9aac3400079e2e6145b1bb93591c3

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