Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bd3ba6bc9bacf1c…

MALICIOUS

PDF

81.5 KB Created: 2021-09-08 17:58:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 458634b66c7527df8611da8b30e8da8e SHA-1: 521a58fced308370c989cdf3545c0041dccafc26 SHA-256: 9bd3ba6bc9bacf1c3677ace83afc1dd1f92668832460c222dfcf3ba7d1355bb7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for delivering malicious content or redirecting users to malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent. The numerous external URIs, many on disposable hosting, suggest a link farm used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drafthe.ru/uplcv?utm_term=libro+mangiare+sano+e+naturale+pdf PDF link annotation
    • http://gorisum.net/fckeditor/upload_file/file/62321357438.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/xonasilodoneriti.pdfIn PDF document text
    • http://taociren.com/upload/file/210907055044665751usg7vn0pypi5.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/30562598854.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/reputeda.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/45637240276.pdfIn PDF document text
    • https://themis-lex.com/userfiles/files/46953741143.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/12048125972.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16136f506b3a45---90376331222.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9b2b4ee4d---45735317103.pdfIn PDF document text
    • http://carbontuning.ru/file/puwisenalemerok.pdfIn PDF document text
    • http://104408017.linker.tw/files/6874348249.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/mapepitafediwolugaw.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/62344484753.pdfIn PDF document text
    • http://tienphat.vn/imagesflashupload/file/wepepuge.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/wuwexazuse.pdfIn PDF document text
    • http://kbidc.kr/upload/editor/file/1631026640.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/tigedemidoz.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/2212168201.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/tezitefageze.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/4175773838.pdfIn PDF document text
    • http://snft.ro/media/file/lakokazu.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/39207399779.pdfIn PDF document text
    • http://cartopack.be/Images/file/bositelomimikes.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_off0000d7a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A7 17344 bytes
SHA-256: 97ec94b84e8aad17d381958345ed9fdab2a27f05a22311dca7b547d634355e84
font_01_sfnt_off000104d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D8 11036 bytes
SHA-256: 0784fdb505476fcfcd166308e056bd2ad12577c801c5751a2f2723e3381acad7
font_02_sfnt_off00011e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1