Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8bfefedb1bda9d8…

MALICIOUS

PDF

70.6 KB Created: 2021-09-20 00:25:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4cd48b3bb6638819a2783419b345b007 SHA-1: 8a9902a5a223f9abb62113c3510ffd6ff4e52925 SHA-256: b8bfefedb1bda9d8fd0e11a052ebdc2aa482bd3ca2b5cec2b46b378189d69ba7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document is designed to host a large number of links on disposable domains, likely for phishing or malware distribution. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=9th+cbse+maths+textbook PDF link annotation
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/75773124631.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/88521106584.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/nibisawoxikizof.pdfIn PDF document text
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/17896899700.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/repiminogonaduzozowunaja.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/sotavosigejafoka.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/dexumam.pdfIn PDF document text
    • http://balbu.eu/uploads/news/file/69272102745.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/98328329670.pdfIn PDF document text
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/94801692648.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/34ce81ffbdb8cb2dd2330263b1e854b6/96165121745.pdfIn PDF document text
    • https://agri-mal.pl/userfiles/file/lemutokilozatapa.pdfIn PDF document text
    • http://tianfonmm.com/d/files/27948069107.pdfIn PDF document text
    • http://www.greenlakecruises.com/ckfinder/userfiles/files/45716507849.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/lonedevapata.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/82899301562.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/xajik.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/81282673252.pdfIn PDF document text
    • http://ducthai.vn/userfiles/file/vugojosibi.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/livusidujim.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_off0000b263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB263 16612 bytes
SHA-256: 7e57b792f98c2ecb2acbd643b223c7ce2ccb798b943c87b6546285d613c20799
font_01_sfnt_off0000dd20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD20 10560 bytes
SHA-256: 3e56681eddcb6d27f49163fa0a64f51b89fbec1afaec5fce93514d27fc43c410
font_02_sfnt_off0000f55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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