Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4c20a039db804e2…

MALICIOUS

PDF

83.2 KB Created: 2021-09-07 15:24:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 739054bb2b2a4119d36aabedff046d25 SHA-1: 2115e8a6584dcd02e9958e0286fa1bc671861027 SHA-256: c4c20a039db804e2222dc84ca0838935abb0b594c9263cb10a5fd385bc411429
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to a link farm, suggesting a phishing or redirection scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies the document's purpose as hosting disposable links on potentially compromised or disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc97e79b64---pijofivuvoxifenora.pdf In PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/75295542846.pdfIn PDF document text
    • http://charolais-hessen.de/write/userfiles/file/9939029137.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/92737290437.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/25534063233.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/14946941705.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/bajubovoluxete.pdfIn PDF document text
    • https://exporoaster.com/app/webroot/files/images/pages/files/genomekonoragod.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021061907170522.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c99af6de694---xotapiwafixubopajaj.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/dopibalolejusunume.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/masatepafekevovet.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/19082465125.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/tijalopuwup.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/gagogumovikome.pdfIn PDF document text
    • https://mackbeks.com/files/file/nijovanozimobe.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/55192735822.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/4891020893.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/tusuvegekazusuzokedizeje.pdfIn PDF document text
    • http://bracyfamilyreunion.com/clients/c/c2/c2db1a97f769835965582c74015c7782/File/samavomed.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/62094684816.pdfIn PDF document text
    • https://aedwea.com/upload/foto/34866427770.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=casio+chronograph+watch+manualPDF 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_off0000df98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AF 10908 bytes
SHA-256: c3645a7325854b1392bd684b5ce15bd1944accb75600cc63d782242896628e3a
font_02_sfnt_off000110d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D3 18416 bytes
SHA-256: 09b614fb93069d5fa6cbe41ec6238ada7595cfe90a0224bc790ad61c24e311ca

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