Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e6621cec667cb31…

MALICIOUS

PDF

76.2 KB Created: 2021-09-17 02:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8e62e924a19c4e29797827399ce72200 SHA-1: eaaf98f7f52f3d58fb586dc427f29c644d244032 SHA-256: 3e6621cec667cb31d0ad117019a46f076163b2cf016bf4aa1b6e2fbee7b31993
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. The PDF contains numerous external URIs and is structured as a link farm, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the link farm structure indicate an attempt to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://philabc.ru/uplcv?utm_term=bheem+toy+mod+apk PDF link annotation
    • http://sunnyten.net/userData/board/file/62601517268.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc14dbed4f---15704342558.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142dedd76f96---josejoridawamolixubo.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/12522401115.pdfIn PDF document text
    • http://banquat.com/userfiles/files/redovaxapu.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/fatotokatomazebuj.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/90647137445.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/kifevasigenatujibojomud.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/90789740212.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/68119406502.pdfIn PDF document text
    • http://singlesync.com/userfiles/file/wewobumiz.pdfIn PDF document text
    • http://ttc-investco.com/img/files/fizupo.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/tidivifutugiwepidub.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/13689356047.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/redadalivubulituz.pdfIn PDF document text
    • https://bak.vn/upload/files/vadetipebewipakovamum.pdfIn PDF document text
    • http://espicycooking.com/files/file///zasenoribofimarova.pdfIn PDF document text
    • https://grouptm2.com/contents/files/63861898516.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/18059282998.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/femogedebosexagusosudad.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/jabulesokonozozox.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/081716233166.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/bebaku.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/veralakopazut.pdfIn PDF document text
    • http://carszana.com/image/upload/File/daruvenuwiposujujidosoko.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/90680283878.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_off0000c7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A5 10404 bytes
SHA-256: 1559a26b3260b63d127cbebc520724bb2e2feca5792c9359da6d7d97b9bfdd35
font_01_sfnt_off0000df4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4D 17052 bytes
SHA-256: ef7c9100c218565cfa36db6a3c74804c341c50529d692225e6be95df7c1d078f
font_02_sfnt_off00010b9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1