Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb0034189724a48c…

MALICIOUS

PDF

69.8 KB Created: 2021-09-24 17:49:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e92bd811ce03de9e47533fe7e620437a SHA-1: 8999e0688b88d8b5c0957e17bfd6476ef55a90a3 SHA-256: bb0034189724a48ce25d12b409b9cf4014559275b7f88de72fd82d24c94ecf11
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs that point to disposable hosting and are structured as a link farm, a common tactic for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://inwebjor.ru/uplcv?utm_term=k+in+english+words PDF link annotation
    • http://bubb.cn/up_file/file/33148111528.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/furilelajewizodefagod.pdfIn PDF document text
    • https://full-flavors.com/img/Data/file/5818082189.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/61891976260.pdfIn PDF document text
    • http://chanhbon.vn/media/ftp/file/15356237715.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/7675957312.pdfIn PDF document text
    • http://denge.aero/upload/files/kibilax.pdfIn PDF document text
    • http://thekreativecompany.com/uploaded_files/userfiles/files/zusumu.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/38901735627.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/fukulujo.pdfIn PDF document text
    • http://hstairan.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/58134859313.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/82638825002.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/palekogapatosurilimopi.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/84700198642.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/defotekaligelupopesoduk.pdfIn PDF document text
    • https://okul.gencreklamajansi.com/uploads/files/nivepefekaxemubosivusibap.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/votezixes.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/216f27718c378258994ab9b6357921e6/17250971844.pdfIn PDF document text
    • http://www.lalorraineperdue.com/documents/pekek.pdfIn PDF document text
    • http://gekon.net/userfiles/file/tifijibefoxusotirifigu.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/gabagukugoraxatuwesemo.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/fatezaledugake.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_off0000b12d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB12D 16160 bytes
SHA-256: a65fffed7125aedc3fb2d624e8fdfc5778fca8a358dc36b187594271f3d0cb35
font_01_sfnt_off0000da5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF274 10344 bytes
SHA-256: 7868a49fbf6c7ff2532f3187dbf39f31b385a0bfd5cb3de27483e6f07c3e9dac