Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d4af08d10b978fc…

MALICIOUS

PDF

82.4 KB Created: 2021-09-14 07:25:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e1b721691bc41c8cfa4d8410034b13f1 SHA-1: 9e02d61e1f4d425da52b69e26a556ba22bbb0219 SHA-256: 6d4af08d10b978fcf9abecd5782925b9e543f6157d43680c33ec40f3415ab88d
126 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to other PDF files. One of these URLs, http://mutamobilya.com/images_upload/files/vapofolase.pdf, is particularly suspicious and likely part of the distribution chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://mutamobilya.com/images_upload/files/vapofolase.pdf In PDF document text
    • http://61kidsclub.com/userfiles/file/rolitar.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/lizop.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/161321b0b8caac---5022011803.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/bizomokimezaseta.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161363f42e3f16---kuwipalisosulelazotobu.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/50897023278.pdfIn PDF document text
    • http://nprofit.hk/userfiles/zamidu.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1631589579_ce265fe047.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/selugedisozesetulogowed.pdfIn PDF document text
    • http://capital96.com/userfiles/file/46106146062.pdfIn PDF document text
    • http://tzsunup.com/upload/17541103794.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/pesoniduzagepuzadi.pdfIn PDF document text
    • http://mega-stainlesssteel.com/uploads/image/files/kevemubenifavakowunilaliv.pdfIn PDF document text
    • http://travelspace.pl/userfiles/file/ketegovij.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/kegomavutoramimidope.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/87571130333.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/sulogusowaginep.pdfIn PDF document text
    • http://www.bash.cl/media/file/kupedajuxokarad.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/ponid.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/vuwajifivipujodasaki.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/5919732455.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/77938478890.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/67662819936.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=call+recorder+automatic+mod+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_off0000db7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7D 10628 bytes
SHA-256: dff7cf1cbab89b146c2760b98d9bac90bf45c4653c882f6f778aa49a520b2898
font_01_sfnt_off0000f3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDF 18680 bytes
SHA-256: f361970cb211f3c08eade6500cdfca91f55399e1ea537773d0e22ade7a7f8d5a