Malicious PDF — malware analysis report

Static analysis result for SHA-256 88a63adbecd66b70…

MALICIOUS

PDF

88.9 KB Created: 2021-09-24 08:06:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6d0c2472866d002568aabf09becf22d6 SHA-1: 9e8a2d010631f6add9ad7ae0cfe2be8f82fbd6de SHA-256: 88a63adbecd66b70d63770f3181d921b128fb5513afaa80ae57fcb5d5dfc1f4e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://chcial.ru/uplcv?utm_term=best+mobile+spy+app+for+android PDF link annotation
    • https://websbag.com/uploads/files/63588384546.pdfIn PDF document text
    • http://rts-3.ru/upload/files/kapenesixawa.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/39402704412.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/30193276070.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/5097c15eac2b2d36ae349d95f815f486/loguxeviwuzefirav.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/77869682291.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e998487a9---18367183879.pdfIn PDF document text
    • https://korankertas.com/contents/files/44114108842.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/41612843277.pdfIn PDF document text
    • http://onroerendgoedindex.nl/images/uploads/bopudoniputulekefixekaxan.pdfIn PDF document text
    • https://ksdc.in/userfiles/file/69024376493.pdfIn PDF document text
    • https://ms01bet.net/contents/files/vumomebevapepokumivatukox.pdfIn PDF document text
    • https://www.bandungpilotacademy.com/file/59161894963.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/kovixelebuvuve.pdfIn PDF document text
    • http://hanyangsteel.com/files/fckeditor/file/11087652346137401825ff0.pdfIn PDF document text
    • http://svenskafik.se/uploads/fckeditor/file/84142729362.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/17236999989.pdfIn PDF document text
    • http://knipia.com/userfiles/file/41374069262.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/13274142409.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/21974634776.pdfIn PDF document text
    • http://eventechsite.com/files/files/11133844008.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_off0000f56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56E 18228 bytes
SHA-256: bf78eafc7efd0f7c3975e4c3e4342c14db2cc5635940e4fca9e17c6d8edb5f27
font_01_sfnt_off000124ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013cc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CC3 10968 bytes
SHA-256: 8095cc8fbc0be4278b0105d6bd5226b07a63c2c131e3bae809088102b7948aae

Open this report in the interactive analyzer, or submit your own file for analysis.