Malicious PDF — malware analysis report

Static analysis result for SHA-256 4509440e12632eb4…

MALICIOUS

PDF

80.8 KB Created: 2021-09-19 03:21:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9d3b035f3e6ed731eb96bf9dcfc70a0d SHA-1: 444f87896e7151552253191279802254ccce91a1 SHA-256: 4509440e12632eb48e34e86c510d0f5a33aba51fbd96c2a8bb544325e1ec562a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, likely to distribute phishing content or malware. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which could be used to facilitate malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://reylab.com/userfiles/file/vokeriroda.pdf In PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/jibixajeluwanogi.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021091212102778084.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/mularawafesufodotugeja.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613996b8c3210---vupobafodez.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/webaxogalunigijo.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/30548925996.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613c94a7d4232---bozabasuwow.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/59833217248.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/ranudadirog.pdfIn PDF document text
    • http://jin16888.com/userfiles/file/78063848303.pdfIn PDF document text
    • https://training-access.com/upload/file/kotetotuloxikekotuzowulev.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/5076873063.pdfIn PDF document text
    • https://ksdc.in/userfiles/file/godifubuwaxug.pdfIn PDF document text
    • https://schachverein-marchhoefe.ch/fcsr/news/upload/file/tegupiteg.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/voregaj.pdfIn PDF document text
    • http://rubensova16.cz/files/file/14415170028.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/musuzunedojozumobuwiro.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/17806703707.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/zudufakofiwomenemipi.pdfIn PDF document text
    • https://gogreenonline.net/userfiles/image/fckeditor/file/2171977292.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/dikusobo.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/23970586904.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/92724264258.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=minecraft+apk+pocket+edition+freePDF link annotation
    • http://www.thaiticketmajor.com/static/imgUpload/files/3080655192.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_off0000d82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82F 17348 bytes
SHA-256: 99bfb7941a21215e495016b4b2a9378e3e9849162e34481f9846c8a097871d98
font_01_sfnt_off0001055a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D71 10484 bytes
SHA-256: d5922515d8b84df75ff9458d044ca0f87a578d25ea9b93ce2c5f61516f3b19f3