Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4b08ca97616792f…

MALICIOUS

PDF

84.4 KB Created: 2021-09-14 00:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 898f0dc8029bef9e6c46411f739c5925 SHA-1: 5753b9bd0a702af33951222bb09928a66fffefaa SHA-256: f4b08ca97616792fe5f4368ef55f7b555c1a1458a12ce3546b01511b3c60a351
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content indicate it is likely used as a lure to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0ea46f724---48290484505.pdf In PDF document text
    • https://alyosserspneed.com/userfiles/files/73650902190.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/60490029237.pdfIn PDF document text
    • http://debschoen.com/userfiles/file/libinotel.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/69333869759.pdfIn PDF document text
    • https://windscrm.net/files/file/75719357061.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109091813054598.pdfIn PDF document text
    • http://suamanhinhlcd.net/userfiles/file/zapedilezogifi.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/dawubakoziforufi.pdfIn PDF document text
    • https://bdata.vn/upload/files/17921692888.pdfIn PDF document text
    • https://maritime-models.com/userfiles/file/jisaxuvevimujokig.pdfIn PDF document text
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/40073544142.pdfIn PDF document text
    • https://lecachet.fr/docs/files/zulesijuminoxovuginebud.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/satusexiduga.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/09/file/pomaki.pdfIn PDF document text
    • http://hejia-ele.net/upload/8511190854.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/detibipadej.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613832c729031---95117287881.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/vekazela.pdfIn PDF document text
    • https://digireg.ch/upload/77559109571.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/dizumipevatenu.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/jibamesamekodiduzof.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/tadojedanafobimefe.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/temaramedajukokefasesu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=oxford+english+grammar+course+pdfPDF 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_off0000e3b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B9 11196 bytes
SHA-256: 08fd4ea45aad5d596d8bd04fab6eef1c99eaff75e2771e9e1633e7df6820aca0
font_01_sfnt_off0000fd80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11592 17828 bytes
SHA-256: 3d2bbb3644e03b1f3ef90e5620e78961d0275b7e75548601ef8ea721619a6d40

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