Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6c49eb201bc5dc5…

MALICIOUS

PDF

70.4 KB Created: 2021-09-17 21:35:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6e05325c30810805bd9136dec8c1dfc5 SHA-1: 81ddf906ffa36a43336075d232996cfa56e7863b SHA-256: a6c49eb201bc5dc571836f0e4fae34915208b0ff9f5aba6c2f71a6dc8a328267
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, with one heuristic identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques commonly used for initial access via malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://ykzn8.com/upfiles/editor/files/93158031794.pdf In PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/mevisujexotolakopokotug.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/pakonojakeror.pdfIn PDF document text
    • https://cyc-catering.pe/disac/userfiles/file/ruxamesemuv.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/59696902227.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/2121151708613d83649a6db.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/suxaruledegukibotapazupip.pdfIn PDF document text
    • http://balalajka.nu/media/nejakesagepinosovupifum.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/nerirurivipi.pdfIn PDF document text
    • http://wujipacking.tw/upload/files/rakugajus.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613253528f993---zisufurukaleto.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/raruwepilugalik.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/50006784162.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/47331089207.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/jerukuj.pdfIn PDF document text
    • http://antropolog.ru/userfiles/file/futuxilabiwis.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/1993633089.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/88039611234.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16135782614af0---ponijuvasifurilodit.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/12257963691.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/34334265060.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/1512120449.pdfIn PDF document text
    • http://cissi.it/userfiles/files/57156356687.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/woxifukaxanip.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/tifiledarexewutokogowapav.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/majesafijatolo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=last+day+on+earth+energy+cheatPDF 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_off0000b42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB42A 10580 bytes
SHA-256: b3c697d29d4acc33a7f4deefa8bf5d03ddcac5ca814dcfca8bf2da176593bae8
font_01_sfnt_off0000cc17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE429 15780 bytes
SHA-256: f67e5cb8006ebba3f7c34f4d3fe0a6352a31cabb9644a9b808c731efb8d361e6