Malicious PDF — malware analysis report

Static analysis result for SHA-256 250e7c701d6982b3…

MALICIOUS

PDF

70.4 KB Created: 2021-10-02 17:58:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 403b7ffc7905a806f77d8c682f28d2ea SHA-1: e23695cbd0f0047da9cc1350943764e46a5beac9 SHA-256: 250e7c701d6982b3ff3d825159ec83e2675d0258a0e479ea3a3e68817e73ea84
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous embedded URLs that redirect to other PDF files hosted on various domains, suggesting a link farm or redirection chain for phishing or malware distribution. The PDF structure and embedded content indicate it's intended to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cructi.ru/uplcv?utm_term=bs2+dave+ramsey PDF link annotation
    • https://valerart.com/ckfinder/userfiles/files/xerefalajujuf.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0912/4ea05c6d4c8d6f6e829c8f88f4e59cef.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/zodotinebe.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/zirojogetovujovopanuvod.pdfIn PDF document text
    • https://inprovitmexico.com/ckfinder/userfiles/files/nabajefuj.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/97395050154.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/noxoxudatipuxoginakivul.pdfIn PDF document text
    • https://oriolefashion.com/ckfinder/userfiles/files/monasipuw.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/xatoj.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/suxazotego.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/zexoz.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/tabizofumidowur.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/wukozabisiseduwuja.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/voxudumasifevomaposolu.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/34289656056.pdfIn PDF document text
    • http://bushurov.ru/images/files/mipufomeve.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-11/images/files/77108105634.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/zimagorewexototakorako.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/ridivezonepova.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/muzitobudetivusalukev.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210907090056.pdfIn PDF document text
    • https://schachverein-marchhoefe.ch/fcsr/news/upload/file/bokiwuwagavogumupi.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16149ff7877f9e---85519424479.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/24155372205.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_off0000b1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1FA 10304 bytes
SHA-256: c2ecca060dad4ef99125fd4a57f7e7a0ec1eacc837b5e9778869ec29d71db75d
font_01_sfnt_off0000c953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC953 16152 bytes
SHA-256: c69d3788755fe4d9bec855f6b297853991fc7ebb5e32d67e44762f514605a836
font_02_sfnt_off0000f277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF277 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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