Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2b5a35ca3324220…

MALICIOUS

PDF

83.8 KB Created: 2021-09-15 23:24:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a2fff0d7a5beb0f2c505a3ca7249a0db SHA-1: 511a0bb8d765419508c8a645498e4d3c52e6c5d3 SHA-256: d2b5a35ca3324220a281207f92436d82d47d00538c0909e61710add372db7211
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external websites, with one heuristic specifically identifying it as a link farm on disposable hosting. 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 embedded URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://garglob.ru/uplcv?utm_term=examples+of+office+productivity+applications PDF link annotation
    • https://testgit.begurholidays.com/uploads/userfiles/files/90997511941.pdfIn PDF document text
    • https://ekinyalitim.com/depo/sayfaresim/file/17735801745.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/28749276399.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/41278006954.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/lokude.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/7631388451.pdfIn PDF document text
    • http://dakov.hu/_user/file/tifajipojonifelobomub.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/69149309422.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/66431286918.pdfIn PDF document text
    • https://alpinashop.bg/files/56690775088.pdfIn PDF document text
    • http://wonikqnc.com/upload/editor/file/1631179118.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-12/20210912045730491431.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/90729968304.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/81757317082.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/a84346ddaa25f7f84b86555db1777311/53978264882.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/59284587322.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/55045049521.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161305b7eabfd8---43769624128.pdfIn PDF document text
    • http://hasadtemizlik.com/upload/file/94780603921.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/tomaxipidikabazesa.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/guwopogukuvojofedozak.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/8484207414.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///fiwix.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/wositogobowe.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_off0000e039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE039 11144 bytes
SHA-256: 9c98e9c40e2643fa330f495177cda2df6573b7a6eba2383669c490ae0b2b25fd
font_01_sfnt_off0000fa4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4A 18068 bytes
SHA-256: 1c5369021934cae589d97b50f9488485fa9d828db8e53b44afce1bc2f1d8f9b9
font_02_sfnt_off000128d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1