Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dd8a7de61b36abb…

MALICIOUS

PDF

87.2 KB Created: 2021-09-18 05:44:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a0eb691648f80857c28ffd0361b1d32f SHA-1: d4a3b8f5c44ea440a771e93c2fd326da0eaa5aea SHA-256: 8dd8a7de61b36abbeaba0c544dfb52dee10aeb621b10e19f1aaae6df3a4d0c8a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF document contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the presence of many external links points to a lure mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://medvor.ru/uplcv?utm_term=five+major+pieces+to+the+life+puzzle+pdf PDF link annotation
    • https://dla-pracownika.pl/pliki_user/File/dotabepasavos.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/xufisamegodola.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///jolabelotad.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/21677589674.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/74704799827.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/p0t61jsvbj7todq1fm87l5elo6/solaf.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/65393909798.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/79397503864.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/27983000944.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9e5302941---busubisemoxuroxuzerar.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/jupogobosutumemisagazozot.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/35167264773.pdfIn PDF document text
    • https://ikansambel.com/contents/files/34878867999.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/87789167810.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210918094606590.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/23967567611.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210911_2d9e1.pdfIn PDF document text
    • https://alcc.c-zentrix.com/ALCC/mail_attachments/multitenant-ws-01/1/1631289749.pdfIn PDF document text
    • https://bloc-immo.com/images/29801910054.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/nuzugozedafagufagid.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/poribuwejanukarojigut.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/94981709935.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/5273701533.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_off0000da38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f24a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24A 18032 bytes
SHA-256: 4109898e2ca479158c3578d2a6739c8718cb7cae86ba43683d2d7bb4653ced22
font_02_sfnt_off00012159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12159 17680 bytes
SHA-256: 8b5b3b7bd489fa97c160b3531f3b9799546613d302dc0fb72aeba671e3cee24e