Malicious PDF — malware analysis report

Static analysis result for SHA-256 9603212dcf3137d5…

MALICIOUS

PDF

72.4 KB Created: 2021-09-10 13:36:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e610f5ccf0d79a172bbd3f0775cd05d3 SHA-1: 9fe4a0a14fd3ed43735ad4fe1849d449d5e66117 SHA-256: 9603212dcf3137d54411c8ab8f68bb48f20b6926026df9c2feb2e7c4032d3cb1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous external URIs, with one heuristic identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and the presence of many unknown URLs suggest it's designed to redirect users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://les-dvorik.ru/userfiles/file/51487983325.pdf In PDF document text
    • http://phunphu.com/userfiles/file/xetisalufunotenep.pdfIn PDF document text
    • https://premiersuli.hu/files/files/vaviwimofesawexurajanijo.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a613e73df---97777058625.pdfIn PDF document text
    • http://giasudaihocsupham.com/Images_upload/files/dutulufatobejavesipumu.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/45372567364.pdfIn PDF document text
    • http://minipit.com/data/files/rimuxavutasuzibodobebukur.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/gibonamudujoz.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/21917071173.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/77867465533.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/rusasazaxil.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/zifonono.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/51097440790.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/petufavagivudexederim.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/88078793793.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/88365122476.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/20728418572.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/6292017507.pdfIn PDF document text
    • https://etimes.mn/uploads/files/zovivog.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/ruvejonibup.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/mafizakenoxulunipupakage.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16133a885d0d8e---ligut.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/84697839050.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+share+someone%27s+story+on+instagram+androidPDF 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_off0000ba69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA69 15684 bytes
SHA-256: aba3ba6d389287fcc1180b845e131abf946d5c3e3dc16854e12081da491c64a6
font_01_sfnt_off0000e285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE285 10876 bytes
SHA-256: 66d9a7e3e32fb816eedeef4e7dda112c5eaa248a6835754013cba3ac1989afb2
font_02_sfnt_off0000fb63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1