Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e00952bf1988153…

MALICIOUS

PDF

81.9 KB Created: 2021-09-20 08:46:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2031b78df567fee269d92354bd0875ca SHA-1: 2fd213b00b2e1b42941fd844b45dd11996ca4363 SHA-256: 2e00952bf1988153faae0ec50046562442be380cfbfbb5c66f71a6fc7c38b9ea
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on disposable hosting. The presence of numerous external URIs, many with 'utm_term' parameters, suggests a phishing or redirection attempt. While no scripts were explicitly extracted, the PDF format can embed JavaScript, and the overall structure points towards a malicious intent to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://chcial.ru/uplcv?utm_term=season+5+my+hero PDF link annotation
    • https://indikino.com/ckfinder/userfiles/files/35862210759.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/82200583072.pdfIn PDF document text
    • http://tabbanbros.com/admin/fckeditor/editor/filemanager/connectors/upload/file/totokoligefabesevizewe.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/luredepemu.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/65344837870.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/gemujiruge.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/kimawifenojelisu.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/62058179590.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16132595228fb4---zamarerisumex.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/mojekofipebe.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/pixafajevegidinukenuvitik.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/7560073588.pdfIn PDF document text
    • http://pscemetery.com/userfiles/file/winifuwuganofeluwir.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/wijuxivifo.pdfIn PDF document text
    • https://texasbordervolunteers.org/userfiles/file/gakixegijeludonevibewax.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/tinifolavokivamaga.pdfIn PDF document text
    • http://sgpeo.pl/users/file/84893875257.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/96528446995.pdfIn PDF document text
    • http://rideco.hu/upload/file/ratofujumo.pdfIn PDF document text
    • https://angkagenap.com/contents/files/dofiji.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/23088924193.pdfIn PDF document text
    • http://jsdarvin.com/files/69041327390.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/fekem.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ratipabatagowimedugub.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/lezuxivuxubewi.pdfIn PDF document text
    • http://pk.mo/userfiles/file/tuvokebasenelok.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_off0000db83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF395 18220 bytes
SHA-256: 3c741ed7a7d8f60f2b11a013f5f2bbc11b57cf54e3e49eb530c0d4f51f5092dc
font_02_sfnt_off00012266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12266 10460 bytes
SHA-256: 4db29454c6f676908d9848a6e1ccf6159e8a651f9fa75bdc8b271270d62bacee