Malicious PDF — malware analysis report

Static analysis result for SHA-256 8928d364d0899cc2…

MALICIOUS

PDF

77.9 KB Created: 2021-09-09 16:27:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cf0afa63785affb628769e324eaeaeec SHA-1: 02a5731ee39f72c3aa9486507617c47f7bc108c9 SHA-256: 8928d364d0899cc2fa747eea39e80d5964164826e54b0fd3c1bd9aff0582ff2b
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 0.9973

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://unitedfightalliance.com/ckfinder/userfiles/files/57317704103.pdf In PDF document text
    • https://jahanchart.ir/data/files/file/vafafisu.pdfIn PDF document text
    • https://petala.gr/userfiles/file/tetijejigago.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/vufeb.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/runigisibuzile.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/guvituv.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/rapava.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/wojugunajajud.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/zugedapugebog.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/53180384601.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161326af413619---segaro.pdfIn PDF document text
    • http://hstairan.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/18019404444.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161337f91ce242---46478451881.pdfIn PDF document text
    • https://dejavuruse.com/userfiles/file/buxoripetikiwujajowes.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/napusesilalapewaradokop.pdfIn PDF document text
    • https://etimes.mn/uploads/files/48784603754.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/33378009921.pdfIn PDF document text
    • http://gazomotor.com/allinone/file/gexodowodikefibiwiva.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/xipulu.pdfIn PDF document text
    • http://travelspace.pl/userfiles/file/puwisovukojugadanojagekab.pdfIn PDF document text
    • https://ivanamihic.com/files/32952464725.pdfIn PDF document text
    • http://ziva-muzika.cz/files/file/94323780563.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/87727687181.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/55717007388.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=anime+wallpaper+tokyo+revengersPDF 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_off0000c70f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC70F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF21 19056 bytes
SHA-256: c3a57a8381efcfb2c1ba2510a821c6a41d3bdab14a4d5777cff464b1d97613c8
font_02_sfnt_off00011083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11083 10932 bytes
SHA-256: 84020f07b015d022aae045f371b8309e5aa3750fd87747ab76ec4ce04e50a5ba