Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1f8bc6fb95fed47…

MALICIOUS

PDF

81.1 KB Created: 2021-09-20 21:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5f6c0bad369e002efb9772cfa4718cf2 SHA-1: a2b333b1621028cc5e8491a0a6ea4e1514d9503a SHA-256: a1f8bc6fb95fed4710b60911389bbada8a40a0062efd4a4258e59e0fa5e92223
86 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document impersonates a cloud file-sharing service, a common lure for phishing attacks. It contains numerous embedded URLs, with one specifically pointing to a suspicious domain ('philabc.ru') that appears to be part of a link farm. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent. While no scripts were directly extracted, the presence of embedded URLs and the lure suggest the document is designed to redirect users to malicious sites, likely for further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://philabc.ru/uplcv?utm_term=how+to+get+contacts+from+cloud+android PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e82a2f9ca---39161438800.pdfIn PDF document text
    • http://tichdiem.surecare.vn/uploads/userfiles/file/55523290616.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/53584692397.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/84501660099.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/67209659726.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/dabigelifumemi.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/roridamuvimuju.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/mixulilinorenozejazove.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/dowetuvunoxojafeg.pdfIn PDF document text
    • http://image.dlib.vn/libedu/news/bvu/20210915/file/82784760761.pdfIn PDF document text
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/busebuxopos.pdfIn PDF document text
    • https://camelcarpet.org/d/files/79280536589.pdfIn PDF document text
    • https://blogsma.com/files/31833227801.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/28381615774.pdfIn PDF document text
    • https://melz-feu.ru/upload/sinilowitorefan.pdfIn PDF document text
    • http://net-marketing.hu/images/files/10370532993.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/97517432169.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/pawulatupetajulifemekeses.pdfIn PDF document text
    • http://industra.sk/userfiles/file/wigofukipofexilorivogujel.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/42083321868.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/xenuxat.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614021771667e---10349826158.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/15074441235.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/27589272898.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_off0000d66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66D 10996 bytes
SHA-256: 4c72cde6b9a55b7f358c84861a29045d1dff3816a749c5c2be57bf1de2f93c78
font_01_sfnt_off0000efc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC9 17944 bytes
SHA-256: aa032b42f1a958ab399c64475c1a45c1e0c63e38f7f28d7fb9a88a558e2ff6e6
font_02_sfnt_off00011e4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1