Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e7de086dfbb5c8b…

MALICIOUS

PDF

84.9 KB Created: 2021-09-08 16:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 87350e2277230aa830c7db7a8aff4b4c SHA-1: 6898c2ca63be945557ffdeaff33cfbda32b58b64 SHA-256: 7e7de086dfbb5c8b030f81a3918f9f57467815c1138319406c7bde442b7ae9a1
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 https://doublehaircenter.com/upload/ckfinder/files/39069115935.pdf In PDF document text
    • http://musorcentrum.hu/files/article/file/dutujofujapurojepexiwi.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319f079c0d3---87464116462.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/9390498705.pdfIn PDF document text
    • http://boldogelet.hu/media/74748416415.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/jidafikovafar.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/fufisetazaturerifusa.pdfIn PDF document text
    • http://morakothotel.com/file_media/file_image/file/mubazudikukopav.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b06f1a184---vilulawaku.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/45861312130.pdfIn PDF document text
    • http://valencia.thepokeluau.com/uploads/files/52901467373.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/divepiki.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/60760644086.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/fovewaxod.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210901_231126.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/jupeb.pdfIn PDF document text
    • http://a899.net/userfiles/file/52660240627.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/rogugamosorenilasudep.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///sivorenewisarexu.pdfIn PDF document text
    • http://sydjpg.com/images/upload/file/20210908_165628_143.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/vunigegoluvazox.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/74583694711.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/94888636982.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109071935193585.pdfIn PDF document text
    • http://fcvperu.org/data/fcvperu/userfiles/file/masekareri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=subtracting+fractions+with+borrowing+worksheets+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_off0000e514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE514 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2B 11344 bytes
SHA-256: 575a5950588111be46f259dc373d02d41409f35f8e7f6e53a50d65c1698bb00b
font_02_sfnt_off0001177a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1177A 17636 bytes
SHA-256: ea3cae4aac4f0e149ba850ae289e8b885c53c3d0409d6484ea0e38916526870a