Malicious PDF — malware analysis report

Static analysis result for SHA-256 9884241afd8dfd88…

MALICIOUS

PDF

81.4 KB Created: 2021-09-13 01:22:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ebfc4d560961764f69c01fd4b4d50971 SHA-1: 45f8916b5908c7d2884016117a4bd3bce32a00b6 SHA-256: 9884241afd8dfd881e05fc4216fb29885a514deebd3a9e3139fded589bdab5f7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with malicious document lures.

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://synerhu.ru/uplcv?utm_term=the+great+good+place+pdf PDF link annotation
    • http://quaint-house.com/images/blog/file/99282214302.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/11330364267.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23788085418.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/52213014415.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/07169647b2fca9b0068a4273d8dae616/93533045062.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/newoj.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/wipofidetiwojex.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/18820319864.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/96870643416.pdfIn PDF document text
    • https://tepihtrava.rs/files/20203020342.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/dusikuzunirivepasef.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/70133280486.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/wodukin.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/9527436788.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/72725039289.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/92643341020.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/vijulejalamowaj.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/99175590483.pdfIn PDF document text
    • http://saktigroup.in/uploads/77669293646.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/zozezino.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/vokam.pdfIn PDF document text
    • http://intertermo.nl/userfiles/file/77054535435.pdfIn PDF document text
    • https://anup.bo/images/files/21057317877.pdfIn PDF document text
    • http://innotack.com/userfiles/files/diligefugovasemanelisajus.pdfIn PDF document text
    • http://perfecturology.cafe24.com/upload/editor/imagefile/fagaselevukikok.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_off0000da77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA77 10496 bytes
SHA-256: 0e335425d668ef441c81433cbf753caae6b385fbf386756e7701f382da97a80a
font_01_sfnt_off0000f241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF241 17408 bytes
SHA-256: 39ac0f542e573dadcee9b2fdf3e6f1239d1c2ffbdd2a1b9a61a9de2d79ac3622
font_02_sfnt_off00011fcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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