Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfabe8f0febfdf70…

MALICIOUS

PDF

70.4 KB Created: 2021-09-29 00:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 5738205ee90f3aa615394b8ad0f7d51b SHA-1: dff42305b77467d081239165944c7651f21fed9a SHA-256: cfabe8f0febfdf7017f8dfff3ca3f8c66b8aefde1917610a8e58b781636781f8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://archism.ru/uplcv?utm_term=french+adjectives+with+w PDF link annotation
    • http://kxnjl.com/userfiles/files/xoluruniwuvezaribib.pdfIn PDF document text
    • http://mega.kz/media/upload/files/92062893822.pdfIn PDF document text
    • https://proxkimya.com/resimler/files/11019624719.pdfIn PDF document text
    • https://verner.lt/images/files/33624029628.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/53492144603.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/67828062353.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/89281670058.pdfIn PDF document text
    • https://granitnet.hu/editor_up/90148832503.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/rcjvb83sup2q5qo9k95fv4mkp6/pusitilevami.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e3995bf3ac---67457187839.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/28847073188.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/80309530476.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/65281666847.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/waputaw.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/35965065604.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/kulivutovafujipi.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/64892232616.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/zewakek.pdfIn PDF document text
    • http://client.diffuse.info/files/45431970769.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/divilofulepini.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/72131243506.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_off0000b09b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB09B 17260 bytes
SHA-256: 3aa7c288720656c7709998739fb4bb72ab1e2baa1168b7ee2dc3f6144e74f2a5
font_01_sfnt_off0000dc15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC15 10560 bytes
SHA-256: de92184e754d880ede8474ab5d22e4a512cd20b3ec8a6a652d0b29b07b98a3f9
font_02_sfnt_off0000f412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF412 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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