Malicious PDF — malware analysis report

Static analysis result for SHA-256 512c0541b878ec99…

MALICIOUS

PDF

80.2 KB Created: 2021-09-05 22:57:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 90b340393305ebb87ae93ecdd9e63181 SHA-1: 6a98251264413660e4953bfdd736e1d3b0537f7a SHA-256: 512c0541b878ec990ab63e33103a3592b063a54bf1992ed05e0ac1471025f947
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The embedded URLs and the PDF structure suggest it functions as a link farm, directing users to numerous other PDF files hosted on various domains. This pattern is often used for SEO poisoning or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://pharma-tools.eu/galeria/file/88661055719.pdf In PDF document text
    • https://likeevent.it/writable/public/userfiles/file/rosisinirobuk.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/42180329819.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/44637748737.pdfIn PDF document text
    • http://2016montemayorreunion.com/clients/e/e5/e530e98a7ee505477716bae2fe71cdef/File/43038230388.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/1a7af141928943006617dce8e49ba43c/sarivi.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/rikuwoj.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/66509898552.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/fifatepe.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/pejufozigepa.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/xaxoliwok.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/68108822178.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/609c8ec2b88ab7126b25964f1efda3c8/28016593671.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/tazaduzeluzilaxigiluvidet.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/60014375855.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/texuwakawamatamogubojinak.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/15123946418.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/purulasanepuwolule.pdfIn PDF document text
    • http://coxfamilyreunions.com/clients/5/56/566bc9ad745482f371977770c3e6b383/File/37436407461.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/46169013916.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=iso+31000+pdf+free+downloadPDF 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_off0000d3e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E3 17644 bytes
SHA-256: e09c3e83513e735ce35264626369ddc901950d1bc2b17c77567c5d00e1827cc9
font_01_sfnt_off00010127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10127 10684 bytes
SHA-256: 0f171988b53ff1fedfbae3a8fb8948af1e0bc9abd67356450e91d08ae81fa069
font_02_sfnt_off000119ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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