Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d2fad5ec99b2c0f…

MALICIOUS

PDF

92.3 KB Created: 2021-09-18 05:02:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7e1d0db17dc063a7e928981c7bd47ae0 SHA-1: 2155c61eec638b79ea8de0207ce038aaf95edfe8 SHA-256: 2d2fad5ec99b2c0ff87b11c97296a503f3d9767c33faba545174de4fc11188da
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malicious content. While no scripts were explicitly extracted, the structure and heuristics point towards a malicious PDF designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://edeins.com/userfiles/file/7516096359.pdf In PDF document text
    • http://asja-doll.ru/userfiles/file/sipuwaruzuzagomokudeluna.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/roredavodezutad.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/3287553383.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/nojolegezusuwubago.pdfIn PDF document text
    • http://medtravel.pro/images/hand_uploaded/files/82083095650.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/71039382903.pdfIn PDF document text
    • http://stevis.cz/files/file/29488499975.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/najusewimenurexerogixi.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/dilozunisudoro.pdfIn PDF document text
    • https://96662888.com/editor_upload/file/49815236781.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/bumejiwudixamexageleri.pdfIn PDF document text
    • http://avtokapriz42.ru/userfiles/file/rinawuwovisilalewuvebo.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16140e30ab4ea9---50068034797.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/47124719920.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/j6pi1rcl7fj4qog6cig2e11rrv/xelajokivezotixoxere.pdfIn PDF document text
    • http://zygzak.eu/foto_dane/wysiwyg/File/8576686583.pdfIn PDF document text
    • https://ww150004.linebot.net/upfile/files/20210911152435.pdfIn PDF document text
    • http://www.alborada.es/ckfinder/userfiles/files/6351378891.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/13689219087.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/zaxazosomepevi.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/zazurozulapajopofitezovaf.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/23704240394.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=a+court+of+thorns+and+roses+2+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5C 10780 bytes
SHA-256: 3e1c781cb0e4867a41ca5d3ed7aabaadd0a4e43b25973facfb184aecdc7dbddc
font_01_sfnt_off0001153a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1153A 20744 bytes
SHA-256: b293f84812ac49898dee5eac1de480ec234c1493cf495a9d6ab149028f8b3c35
font_02_sfnt_off00014bf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1