Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7ae7ceaa0426bb8…

MALICIOUS

PDF

81.8 KB Created: 2021-09-10 06:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cc9e778437e0f1c3d4930c0c4589f5ab SHA-1: 73a30b681fdb25c186db91726f6b1470e30dffa4 SHA-256: c7ae7ceaa0426bb8c0f9e5ff59617d0d5149f87fad32f689ad11563a6e67b797
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting it's used for phishing or distributing further malware. The presence of embedded URLs and the nature of the heuristics point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 https://garglob.ru/uplcv?utm_term=ios+14+weather+lock+screen PDF link annotation
    • http://avandcie-automation.fr/ckfinder/userfiles/files/dozodenal.pdfIn PDF document text
    • http://ihanzao.com/userfiles/file/20210904215634_1610583629.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133b5a480bf0---61601514996.pdfIn PDF document text
    • http://yves-segers.be/userfiles/files/76393050403.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/rajipekakuwo.pdfIn PDF document text
    • http://phutungototuanphat.com/img-tvdl/files/gizoruwewubamujirobiwud.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/zorosorejolewoguvuvigo.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/85135568572.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/xerapudigenilozaju.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/pesolafokizuturobifomawoj.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/40159656940.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/65173507539.pdfIn PDF document text
    • https://digitaluzaktanegitim.com/calisma2/files/uploads/safumapis.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/84057344727.pdfIn PDF document text
    • http://alkanboya.com/files/file///35583041056.pdfIn PDF document text
    • https://dcimx.com/files/40119373619.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4fa3c4ba6---lixegiwebiropeg.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/65079600403.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210902050039.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/warukosedemagofosi.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/76905912522.pdfIn PDF document text
    • https://wigs4less.net/nbloom/fckuploads/file/19236531426.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/91213669021.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/tezizabemirilexisixi.pdfIn PDF document text
    • http://youil.org/userData/board/file/zujalakisizow.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/53583541409.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/kowuzavavuwibu.pdfIn PDF document text
    • 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_off0000d76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76C 19176 bytes
SHA-256: a7cf96a5dd5fb87de2f38645fd5067a9af5cd92c34e06bdfe21f4f0816d519bc
font_01_sfnt_off00010939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10939 10492 bytes
SHA-256: b2f212d262c4edc14f87126411a6ccffe0d502f514e63c9061ac7ca812b8c4f1
font_02_sfnt_off00012140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12140 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1