Malicious PDF — malware analysis report

Static analysis result for SHA-256 c09069ec93cc03aa…

MALICIOUS

PDF

74.3 KB Created: 2021-09-24 12:49:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d6f009d9248adef7e0341ad3fa6114a2 SHA-1: 88183da89cf054db59b46c77e02610266bc18fdc SHA-256: c09069ec93cc03aada7f92734623ca92f63d8ab0e19a6c2d06807d6e70e78c65
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated, but the presence of external URIs and the link farm heuristic strongly indicate a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://queure.ru/uplcv?utm_term=off+the+road+game+hack+download PDF link annotation
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16140009d67ee5---nuxal.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/rolaju.pdfIn PDF document text
    • http://lukinserv.hu/file/96457761937.pdfIn PDF document text
    • http://mapect.com/upload/fckeditor/file/88665999185.pdfIn PDF document text
    • https://efnnma.org/files/file/31157109894.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/76371654655.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/50255956748.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/zokofiwinozinix.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/13466659014.pdfIn PDF document text
    • https://designclarf.it/file/potafozanasujabuzixuze.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/muruberewezumazonomuzude.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/mhjiev7sloh2unccq2ia9e6oq3/nobide.pdfIn PDF document text
    • https://actor-conseil.com/files/file/80691920952.pdfIn PDF document text
    • http://artcvajk.friendship-match.com/upload/files/likojejit.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/67719063757.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/botap.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/71523870302.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/75271798712.pdfIn PDF document text
    • http://xycrusher.com/d/files/duwobixitu.pdfIn PDF document text
    • http://kieryk.pl/img/userfiles/file/wutuwokeposutu.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109032003013203.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147a0cd0cae1---pekiwizesofimaves.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/xuxivepixafakazijob.pdfIn PDF document text
    • http://jlicentral.com/images/authors/file/73509301174.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/gunino.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_off0000b7d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D9 19768 bytes
SHA-256: e75a46f25a50cad1d201fee4d38f3a28cf888a5156e55bfa4ff1b87616229d9c
font_01_sfnt_off0000eadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F2 10868 bytes
SHA-256: 9275ee6ce7db9a6c603ccf54f3f50abdb31117d66124f2186c5b4a78c735a1c8