Malicious PDF — malware analysis report

Static analysis result for SHA-256 0990b88c26779681…

MALICIOUS

PDF

79.1 KB Created: 2021-09-16 03:30:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1e6e5417f5864f2879143571b8833432 SHA-1: ce831002e4ef3d7d9b89118c0cdabfc3728e5ca5 SHA-256: 0990b88c26779681dd0ccccbc4240f840cdda66ed31c7f9ac17d51b55fb9c6b6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded links, many of which are hosted on disposable domains and appear to be part of a link farm. The primary function seems to be redirecting users to external sites, potentially for phishing or to download further malicious content. No scripts were extracted, but the PDF structure and embedded URIs suggest a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://huntic.ru/uplcv?utm_term=temple+run+3+hack PDF link annotation
    • http://solar-makernavi.com/ckfinder/userfiles/files/77415641640.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/94849618993.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/21976650458.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/38899970392.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/93349030373.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8f7ec0f6c---mivunusegiburene.pdfIn PDF document text
    • http://identik.hu/editor_up/wavazujokilakujose.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/sibiwo.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/guzoloredazikired.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/77287465015.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/19906579504.pdfIn PDF document text
    • http://land89.com/ckupload/files/15261121459.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/31237791627.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/26764425385.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/35454872192.pdfIn PDF document text
    • http://dytac.hk/userfiles/37157279382.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/boximuzugujisalogifex.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/ruvenuburadedo.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/81251749077.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/2ef1a0d0827c79f458306d2b9ecf42b3/91624080525.pdfIn PDF document text
    • http://vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/44669984857.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/falidazesenikaxusetewuno.pdfIn PDF document text
    • http://mapect.com/upload/fckeditor/file/witukin.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_off0000d46e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC80 16832 bytes
SHA-256: a23735f2036dad5acbc44e2671eac8ecacfffdb0e9cff22bd97c92190d140f5f
font_02_sfnt_off000117ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117EE 10488 bytes
SHA-256: f5dfb124fa7bbec127b9ea36a7648140758e06fc25dc5233f45a7835651041dd