Malicious PDF — malware analysis report

Static analysis result for SHA-256 797ca0d62774b9e9…

MALICIOUS

PDF

75.8 KB Created: 2021-10-02 13:27:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 031e8595dded0fa03e4787d08c81b36c SHA-1: bf92759dc03ef4cba88b89ead23ace0935803f07 SHA-256: 797ca0d62774b9e970df3012aa0e671d3af4cc54077661131032aa23c9714a46
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://pistant.ru/uplcv?utm_term=now+here+you+go+again+you+want+your+freedom PDF link annotation
    • https://xn--z4qq44i.tw/upload/actfiles/44695848905.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/lusuxizesi.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/gazar.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/r07fflg2ht8go3pap7i7pdg6i3/26900269489.pdfIn PDF document text
    • http://www.bash.cl/media/file/13547133089.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/27071367135.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/16362127508.pdfIn PDF document text
    • http://edukoc.net/userData/ebizro_board/file/62583459916.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/62479658315.pdfIn PDF document text
    • https://emenu.hu/editor_up/46585370499.pdfIn PDF document text
    • http://gcsiva.com/files/userfiles/file/84645364515.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/xilowesilagij.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/5089920806.pdfIn PDF document text
    • http://kccmaul.com/files/files/widovililotejitiwareropad.pdfIn PDF document text
    • https://777mto.com/contents/files/vugusunapoge.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/78483163911.pdfIn PDF document text
    • http://hengfengpaper.com/filespath/files/20210921160456.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/lusokebatopepovefesupid.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/93190355677.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/b1dff9bb18cedbb7db52c421db0caec6/47352979672.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/34071991119.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/penapesominabot.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-3/20210903152138725163.pdfIn PDF document text
    • http://tfe-design.dk/userfiles/file/44230849038.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/nixusosurerisujemerasafow.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB004 16644 bytes
SHA-256: 49b474fdc23736fb3fce90a33ba46b940d305afbfa04a1b5ec988edb142b89a1
font_01_sfnt_off0000da2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f23c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23C 16232 bytes
SHA-256: 01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684
font_03_sfnt_off00010816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10816 10864 bytes
SHA-256: cc9c885d5f966c27874323b4bf3a3cb9c4510cdc339acff4197690a5bb86dd39