Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5bf5cd3f33bbff8…

MALICIOUS

PDF

77.0 KB Created: 2021-09-23 04:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 72118d12bfd1c0da82b255c1420e4b60 SHA-1: de48fa6873d070b3dca38cbfe5bcff1bb6557420 SHA-256: a5bf5cd3f33bbff8bc74d65d9169a17a3310ad04db48153f4a5b5630f489e4aa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded URLs pointing to various domains, consistent with a link farm designed to distribute malicious content or phish users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies this pattern, suggesting the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://cabanagarden.hu/editor_up/61116119528.pdf In PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b705d536f3---82871465413.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/bofaguba.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/memevirakaxobugem.pdfIn PDF document text
    • https://nls.vn/upload/files/67093465652.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/xadekimenulatomiwamuteke.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11291319668.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/gomivopitokik.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/69141309628.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/rijunuxetopep.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/70142634469.pdfIn PDF document text
    • http://www.gobarging.com/uploads/textareas/file/3246764193.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/36257797622.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210908061206.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/24648268687.pdfIn PDF document text
    • https://kokomanis.com/contents/files/78770638306.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/9162956188.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/pegovujirisavaxakulomogu.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/36745307836.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210910125747.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/wiwopegibiraxisaluruge.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kifofit.pdfIn PDF document text
    • https://vinaconexmec.vn/uploads/news_file/xudujaxiluxowira.pdfIn PDF document text
    • http://ativn.com/upload/file/6348517140.pdfIn PDF document text
    • http://henca.com/files/details/file/61024971121.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/72587464470.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/bibupi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=p+five+letter+wordsPDF link annotation
    • 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_off0000c8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C3 17812 bytes
SHA-256: efd1f48476df5cd29b910c8706f97603ba9f2e89363e6cf839f5b526e880e82b
font_01_sfnt_off0000f72a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72A 10236 bytes
SHA-256: b40d638621f838be3f3bd1e8c58155cde35a5d2bb135ed85361f1c794d59375c
font_02_sfnt_off00010e50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1