Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9cfe5e8c3867bfd…

MALICIOUS

PDF

74.3 KB Created: 2021-10-10 03:05:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 6be45b9dee179b00380ae511a445070d SHA-1: 60b051973e62ca56f0ddc147e346ed4dfe4302aa SHA-256: d9cfe5e8c3867bfdccb9cae92e669181743b8f253ae319e90da2886e218bd88e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://catamma.ru/uplcv?utm_term=tonight%27s+the+night+is+the+night+we+lose+control PDF link annotation
    • https://aslplastic.com/ckfinder/userfiles/files/73940882025.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/kebesusaraxop.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/lerodajuduruf.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/33351038672.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16141ae21cd044---fivalasel.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/33834588746.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/pexovikesipiduguxova.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/taxilusogowobaxabepefizal.pdfIn PDF document text
    • http://suruburi.net/mm/file/roderimu.pdfIn PDF document text
    • https://birudongker.com/contents/files/nowibikepejiwozukiluf.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/46188335033.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/91663052227.pdfIn PDF document text
    • http://gibisch.org/files/files/7770194325.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/liluxexiture.pdfIn PDF document text
    • http://storemisr.com/uploads/files/89451652363.pdfIn PDF document text
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/10373984166.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/41053638732.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/wexifefowelaliwu.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/kuzasurosabot.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/voresimivepuvuzinuv.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_off0000be6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE6A 10432 bytes
SHA-256: 3ea7db14ae77a6a0a30fb3d495bf9de1b09edb9c7e80f16b7242dc755b7c0c83
font_01_sfnt_off0000d61f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61F 17796 bytes
SHA-256: 32e3681a82258ae72bfeffa10e76c45b1fb10285e30c32fc5fe318cab03cf908
font_02_sfnt_off000103ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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