Malicious PDF — malware analysis report

Static analysis result for SHA-256 c507f585220fb6b8…

MALICIOUS

PDF

74.1 KB Created: 2021-09-27 10:11:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7ec6e3d3ae52c58ce7ab5a1678145532 SHA-1: 60b2f8221d315ba258212d66b2cb8bf60b5098dd SHA-256: c507f585220fb6b81a67316a422d6fc19d14877552212d636d89897955e4d56a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. While no scripts were extracted, the presence of many suspicious URLs suggests the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://wawabed.pl/uploads/userfiles/file/jadidemutisubozasodomaza.pdf In PDF document text
    • https://greenlandpark.com/uploads/files/goweganinom.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/65599543961.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ed061dba9---vazumaxefigojagopux.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/16926963670.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/xavevepanituzaxatikoke.pdfIn PDF document text
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/7192869379.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/vuvamijuva.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/ritisolamovajufapugazapu.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/bezokuwugebosebapefakol.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161423a52a0273---61826634670.pdfIn PDF document text
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/16385794044.pdfIn PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/37962841399.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/74304833968.pdfIn PDF document text
    • https://soechi.id/userfiles/file/34716334508.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/nerimijinipizeninixodabi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=surah+yasin+al+ghamdiPDF 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_off0000b859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB859 10632 bytes
SHA-256: 4b134ddb855bf268fae2155d60b3d2d79f1170441b00ecb5dd6a47010bf43533
font_01_sfnt_off0000d02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD02B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83D 19592 bytes
SHA-256: 7ad54a024979b044ddd6534827c105f86b7c500f0ddebe16dc3aa6195188017a

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