Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5f9da4506a85452…

MALICIOUS

PDF

76.8 KB Created: 2021-09-11 18:43:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e69bfb552e53bd8e9ccaa51abc2379b3 SHA-1: c7583f86632d7ca2ac6f3a725bceb2d45e39e2c1 SHA-256: f5f9da4506a85452bed7f832ee04f37394994bc33dbe0627323f4fe937ab2cc7
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers as malicious. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for distributing malicious content or conducting phishing. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates this behavior. While no scripts were directly extracted, the nature of the embedded URLs suggests a high likelihood of redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 4

  • 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://crysiq.ru/uplcv?utm_term=agar+tum+mil+jao+mp3+song+free+download+mp4 PDF link annotation
    • https://consultingexpert.eu/fckeditor/userfiles/file/78004970886.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/19595650464.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/fazinezoxelipaso.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/ziwafa.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///buvifunuz.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/mojajajenijefavul.pdfIn PDF document text
    • https://lorus.rs/files/75007937309.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/nirakuvejupajolub.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/88102483170.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/0pfs4u5sgmn73abfkcrrun1042/jewanuzinixajevuf.pdfIn PDF document text
    • http://ssss-sangam.com/userfiles/file/kosikamononalifowa.pdfIn PDF document text
    • https://digiconelectronics.com/media/gaxuben.pdfIn PDF document text
    • https://careerexpo.alljobsinliberia.com/ckfinder/userfiles/files/wawabiz.pdfIn PDF document text
    • https://successalpha.team/upload/files/81321802733.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/97867290916.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/gilulomoraramuwuv.pdfIn PDF document text
    • http://hodori247.com/uploads/files/20055771431.pdfIn PDF document text
    • http://htwy.com/upload/file/38122786024.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/5833833366.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/kilibu.pdfIn PDF document text
    • https://gjbuyerbroker.com/userfiles/file/53205461871.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/31489349180.pdfIn PDF document text
    • http://www.tahi.hu/ckfinder/userfiles/files/zotasofonazuzageberew.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_off0000c2a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2A8 18528 bytes
SHA-256: 9fb4ef4d440b8d4b3979c555db310267ba2188b283bca0a94b12ee84bee7b939
font_01_sfnt_off0000f359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF359 11388 bytes
SHA-256: 2c2618055a975da2d3a855dc274770a0fc75d5510b4a5050a8ad9554b86f39c5
font_02_sfnt_off00010e1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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