Malicious PDF — malware analysis report

Static analysis result for SHA-256 712caef0e965a242…

MALICIOUS

PDF

81.2 KB Created: 2021-09-15 22:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fb5b5f47e23dacb3b1b5fec5ebfd6e1f SHA-1: 853764c8bee52fc63bf57c837939e0778eef348d SHA-256: 712caef0e965a2424e69e4f1bc33751c07c624dedd9818ff64099b48dedde351
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm, likely to redirect users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=watch+free+guy+online+free PDF link annotation
    • https://pointswestliving.com/ckfinder/userfiles/files/23663499243.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/kojisojixired.pdfIn PDF document text
    • http://bibikid.ru/upload/30567269810.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/52860482927.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/raxokijaxatepojujim.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/kexuxivililanonikuzagov.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/kodevesip.pdfIn PDF document text
    • http://araulmor.tel-cor.com/images/library/file/54320161891.pdfIn PDF document text
    • http://www.iciparis.ru/ckfinder/userfiles/files/76403376696.pdfIn PDF document text
    • http://master-vin.ru/files/file/xaseverafomodizabumubabol.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/94195013977.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/zoxefodunusumetoj.pdfIn PDF document text
    • http://ildong.org/sa_upload/userfiles/file/20210903191842.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210909075931.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/c739a03d0a493e9fafc83efb10069e05/79842345828.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/sebevuvigunifo.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc879e7db0---59489171908.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/53121270251.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/42623506035.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/texomasokevojedunirunawed.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109150459545022.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/93953554469.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_off0000d87b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87B 10652 bytes
SHA-256: 800763c5e9f4e4027f3cc9fef4b69c63d608d697e81e4c1f41b31b0a5dfffc55
font_01_sfnt_off0000f0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EF 17988 bytes
SHA-256: 6513031e1c9d07c6fbe9930cc530f6908e61bc691eb0629dfd7707106ee45a99

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