Malicious PDF — malware analysis report

Static analysis result for SHA-256 5280775d258eff5f…

MALICIOUS

PDF

82.0 KB Created: 2021-09-27 12:09:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: cf2a35d5576bb98aa1fd5feb359e0809 SHA-1: 6c55af723afc5583116b44334b30436241753f2a SHA-256: 5280775d258eff5fa6e82fdb4c6e1da7dac5278135b85797cd798d00debb8400
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to link farms on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting the user to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9635

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://rosedreamholidayhomes.com/ckfinder/userfiles/files/labekitelepajorilixobenir.pdf In PDF document text
    • http://ducthanhtam.com/uploads/userfiles/file/78690001058.pdfIn PDF document text
    • https://lanjutpt1.com/contents/files/60855151814.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/nofofazefusamewawefose.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210920075047156614mwyrca.pdfIn PDF document text
    • http://xn--spreewaldpension-lbben-9lc.de/meineBilderAlbertGrundschule/file/mukarukada.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/80478414552.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/43492426394.pdfIn PDF document text
    • http://goref.ru/files/file/jivovasasutapevajuniw.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/dazavukafavesojuneradetop.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/20265862209.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/73353996696.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/pamusabolaperifuwilafe.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/84634447322.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f155078323---97446998698.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/pezexunipamilujes.pdfIn PDF document text
    • https://red-adlay.com/upload/files/gixajot.pdfIn PDF document text
    • http://ufcnagykanizsa.hu/userfiles/file/54468817703.pdfIn PDF document text
    • http://spad.kr/userData/ebizro_board/file/94924811020.pdfIn PDF document text
    • http://parfumland.sk/upl/gidawiratomurod.pdfIn PDF document text
    • http://lizhechem.com/upload/files/18319332166.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210920_9FFB882BA6D3C596.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021952329584160.pdfIn PDF document text
    • http://mastervin.ru/files/file/zelinojevugasedegeg.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416455e070a---38177973406.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/zapeji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=my+hero+academia+no+adsPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5E9 10596 bytes
SHA-256: 12d8f4d7e7c5a53061720850590e65ebf0c45839bdc2bf798802fa15fa49262a
font_01_sfnt_off0000cdea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDEA 1908 bytes
SHA-256: e1b34b56f766b52dd7f6f1608e19e75f17ced996a683346d6fdfd66d0a8877c1
font_02_sfnt_off0000d6b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B9 16488 bytes
SHA-256: 3b2be5eebb5c41074b94ce51e946f9fd85c45c4bed0b8333623c058713d3371c
font_03_sfnt_off0000ed5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off0001056f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056F 20264 bytes
SHA-256: 22ba66e7e7c1e9cdf5490d482407e175fddbe6b2aa1703fb97df4fcc7b4e63d1