Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c7730e422700fd3…

MALICIOUS

PDF

78.8 KB Created: 2021-09-18 14:56:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 09a99a8636dd04b2801fae88b01fccea SHA-1: 3ad8fda9740cf4d286107d9da97be39d100a2a92 SHA-256: 3c7730e422700fd315d48563ffdf9cbc2f4e63687cc729af7f370d6e82366d11
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to potentially disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded content are consistent with techniques used to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://www.stnedu.com/ckfinder/upload/files/kirukemevirifudib.pdf In PDF document text
    • https://parklanehotel.asia/userfiles/file/32258374138.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16137cc2d4a43f---xafofililotolesaxojigu.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/62842815404.pdfIn PDF document text
    • http://pvvc.cz/files/87145959647.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/29059439620.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202109121650129847.pdfIn PDF document text
    • http://guowangcable.com/d/files/xiwemitazapobatig.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/34200506777.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbc6a3312e---87264195920.pdfIn PDF document text
    • http://lepetitjaunais.com/userfiles/file/2574114077.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/42210409980.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/83695910624.pdfIn PDF document text
    • https://netkat.in/ckfinder/userfiles/files/lijudup.pdfIn PDF document text
    • http://maidichike.com/upload/files/17652295088.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/wawojoji.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/dekevevul.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/46880209572.pdfIn PDF document text
    • http://onlinevay.com/upload/files/70335488334.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202109061834169132.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/lenexojijurixe.pdfIn PDF document text
    • https://cuichi177.com/uploads/files/202109150322107679.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/xudenupetejusidivubisuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=merge+video+apkPDF link annotation
    • 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_off0000cd8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8C 18800 bytes
SHA-256: a2de34d4d6ae85eba11e4465611122688a5955b1f9e9ba0456663cccd74a5079
font_01_sfnt_off0000fee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FF 10300 bytes
SHA-256: ba04ba4d9d2a334a435fd369bf3ab870989b4c8a40b6a03726aade7523f97c16

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