Malicious PDF — malware analysis report

Static analysis result for SHA-256 b70555a64c6e5f7c…

MALICIOUS

PDF

80.6 KB Created: 2021-09-20 15:18:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b79afa22048b94b7a205b74e46076259 SHA-1: b28c9b9fd65e3bb7af613d4f06702339de84b122 SHA-256: b70555a64c6e5f7c4aeedb9974c01e64775da4f7bf8d8afa74ee6026f45d0c59
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to PDF files on various domains, indicating a link farm. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the high ML score confirm this malicious intent. Although no scripts were explicitly extracted, the structure and numerous external links suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://okazionche.com/files/tebuwifa.pdf In PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/vujog.pdfIn PDF document text
    • http://xinchenfast.com/upload/file/tawin.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/fijiku.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7088809296.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///28929244042.pdfIn PDF document text
    • https://self-storage.sg/images/uploadedimages/file/mofalivolafa.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614675ca80955---vujorikilaledilik.pdfIn PDF document text
    • https://frutalmente.pt/site/upload/file/70703929095.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/jemamepi.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/xamavigufefelitomiva.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/lavowu.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/napuborapa.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/f8449cd91f68b9f80b20ffba1d4e8727/78019677455.pdfIn PDF document text
    • https://lyubomiradineva.com/files/file/fegelezaxewi.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/46117846686.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/dixazovefapuzuxepevajupe.pdfIn PDF document text
    • https://panelshock.com/userfiles/file/17825149244.pdfIn PDF document text
    • http://skontrolsengineering.com/file_media/file_image/file/64899170439.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210912_092927.pdfIn PDF document text
    • https://stancijanegrin.com/userfiles/file/lakufufokinuwuvujedomowa.pdfIn PDF document text
    • http://ptsound.com/plugins/ckfinder/userfiles/files/86720046808.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=totok+app+apkPDF 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_off0000d614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD614 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE26 18984 bytes
SHA-256: 6dd2761cc97a3c7bdf5d07f81c119471c06d624ffa46cb436fbae00511d913aa
font_02_sfnt_off00011fee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FEE 9660 bytes
SHA-256: d9786c62e021e4be8df545a00b52f8ec6ed2c8758037a84ffa52343149f80149

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