Malicious PDF — malware analysis report

Static analysis result for SHA-256 85ee09b447ab0c95…

MALICIOUS

PDF

76.5 KB Created: 2021-09-14 08:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 89173bc64de45b0cd688e0f4d3921d30 SHA-1: 8652f1dc24870aa640b91fcd440e5a28795d266c SHA-256: 85ee09b447ab0c9509742f19e01b72fc76869122657b585b616d82ddb962fed5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm directing users to multiple disposable domains. The PDF contains numerous embedded URLs, suggesting an attempt to redirect users to phishing or malware hosting sites. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggests a malicious intent to compromise users through external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://khachsanmyngoc.com/upload/files/komapivapopivaver.pdf In PDF document text
    • http://kasaitogo.com/uploads/files/wikanaro.pdfIn PDF document text
    • https://termoformat.md/img/files/60816318399.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/90623913658.pdfIn PDF document text
    • http://rainhouse.kr/data/editor/file/1943961775613e7f4d13721.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/69014652579.pdfIn PDF document text
    • https://nusbetaja2.com/contents/files/13024176854.pdfIn PDF document text
    • https://kujainspectors.com/candyticket/uploads/page_images/files/vuvifabasogonawuxu.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/17138403335.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/detabulopunupiv.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/taveladopugawusopije.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/94802640271.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/45587024518.pdfIn PDF document text
    • http://simp-q.ru/userfiles/file/luxifelefabikorub.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/sevepufurexitawamoloz.pdfIn PDF document text
    • https://ocw.tw/uploads/files/32168423205.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109140949264791.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/safevota.pdfIn PDF document text
    • http://gyn-ordi.at/myPix/file/vogafaximuvadogarasavawuv.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/xibiraxipasatinev.pdfIn PDF document text
    • http://104408017.linker.tw/files/jewasokexugumosuvawik.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/65181715404.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/2037467090.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/48602307635.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/maguzixoserukuvugane.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109080302366820.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=o365+calendar+not+syncingPDF 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_off0000c581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC581 11156 bytes
SHA-256: b8c8aa7f3f221f5829921a2a32451073fbf9f61f729c3af2328ea0d1cc17f44d
font_01_sfnt_off0000df9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9D 17324 bytes
SHA-256: bf24e628c1cb525cca332ce934585ba72f251908791a4588078212eb275e82ef
font_02_sfnt_off00010c42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1