Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9e5af20adae1648…

MALICIOUS

PDF

73.6 KB Created: 2021-09-25 15:12:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c1fe73dc2764476462c9a0fcbd234389 SHA-1: ba61d748f1e71dbf0a3840777b55844521a09813 SHA-256: c9e5af20adae164864e17500927a9c128dc5263be16202775fd17d69449310ff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to domains associated with link farms and disposable hosting, suggesting a tactic to manipulate search engine results or distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_21_10_02_16_6118.pdf In PDF document text
    • http://hndgyl.com/v15/Upload/file/2021911918328315.pdfIn PDF document text
    • https://booburger.myagenda.cz/pictures/editor/files/tinivonujalezo.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/volefuzibanamol.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613323ebc4f07---43319971979.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/34628440092.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/xotesimuli.pdfIn PDF document text
    • http://lawyergz.net/uploadfile/files/kekisabiwaxatotevasa.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/fd7ba1ff8db75552eeec797cbc0cbcfb/45816862691.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/30176063982.pdfIn PDF document text
    • https://ms02bet.net/contents/files/kewotexije.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/13247280725.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/senixum.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/57626050632.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210919012324-sawawevezi.pdfIn PDF document text
    • http://miass.realxenon.ru/uploads/files/75488390298.pdfIn PDF document text
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/78811602537.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/32880686098.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/78846621351.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/39869082063.pdfIn PDF document text
    • http://xn--b1agpbmdtf.xn--p1ai/upload/file/xolewoxumiselusu.pdfIn PDF document text
    • http://formacio.fic.cat/uploads/file/boxitobabewog.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/77634861128.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/37478198886.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=java+code+for+calculator+in+android+studioPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/nezawudavuw.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_off0000b7d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D5 18304 bytes
SHA-256: 6804b0346264978a1d36a2c2b056f5b1c8249a23dd8ae095216ffbfd78ce2504
font_01_sfnt_off0000e78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA5 10624 bytes
SHA-256: 9a264e558f910ae8ab593d8918feb6ac1ce2b84ea22910c5bacf1e1ddae95e9a