Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca4689f6f63111b1…

MALICIOUS

PDF

72.6 KB Created: 2021-09-11 22:28:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3c90594644bc91409f50a44705048d32 SHA-1: 48594c7cfdda784e3095fe1fadd26d5ee4cc662e SHA-256: ca4689f6f63111b10c9158612fac62e51b6a97b0f5b5116acc5a5cbef875fc2e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with a high heuristic indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://nuitsdartistes.eu/images/file/75033543221.pdf In PDF document text
    • https://aquatrustfina.com/userfiles/file/jebogifu.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/76481135943.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/supov.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/5554309217.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cef0913fe1---76452724191.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/bisikurolopafuwuvevo.pdfIn PDF document text
    • http://husplaza.hu/editor_up/notofuworefugudizuno.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/lavuf.pdfIn PDF document text
    • http://jenistudio.com/upload/FCK/file/fuzakanuvewamad.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/36045258852.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/5254782445.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/87109719510.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/48580908445.pdfIn PDF document text
    • http://yibetter.com/data/files/tijexawoxiw.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/61609382446.pdfIn PDF document text
    • http://napiarsaigh.com/images/60195108706.pdfIn PDF document text
    • https://sleepthai.com/piceditor/file/pilegawirijapexagigenog.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/466862d90b9b57a8bb43c9a5bd137666/tapigulekinezozamod.pdfIn PDF document text
    • https://wittnebel.dk/file/fufaxuvixil.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/nudupifana.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/bivunajuwowixuwexe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=cheat+o+matic+para+androidPDF 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_off0000b864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB864 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d07b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD07B 10596 bytes
SHA-256: 772a3632b6f513720fd640a0fe620cdf71df2bb0ce58f538231c3001fa46bbe5
font_02_sfnt_off0000e877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE877 17328 bytes
SHA-256: 14747ba362df074dd65ac69d59b5e57b90c72ee78a877cfbaa44b7b9f2c2dc4a

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