Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3e77fa7614187d4…

MALICIOUS

PDF

88.3 KB Created: 2021-09-11 23:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: f7efc5adcfaf52d1cdb5e2d8a0dbe053 SHA-1: 8fd88ad222564f4b6d0f316168be248454f5e0a2 SHA-256: e3e77fa7614187d43b05f53e395f9ab0343f22de1ae91f2e2faae7c2423466ac
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 0.9966

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://krisoc.ru/uplcv?utm_term=gta+san+andreas+modern+mod+apk PDF link annotation
    • http://polins.org/public/userfiles/file/napuxodiga.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/14224669897.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/lulumazaxilazarixabug.pdfIn PDF document text
    • http://mgtuae.com/uploads/file/94984967689.pdfIn PDF document text
    • https://digireg.com/upload/tikenile.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/keranedotosit.pdfIn PDF document text
    • http://lagrupacio.cat/file/7388481558.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/dejepibifikil.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/22463098518.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf174ea28c---jaluzadenarolefazupovaba.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/30341126736.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/dovodis.pdfIn PDF document text
    • http://lepal.sk/ckfinder/userfiles/files/wapimalomob.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/roredono.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/20958041377.pdfIn PDF document text
    • https://qwert5.com/psum/admin/userfiles/file/natibuzudez.pdfIn PDF document text
    • http://gymostrov.eu/gymostrov/userfiles/file/somejofusojowija.pdfIn PDF document text
    • https://wojczak.pl/userfiles/file/65849352915.pdfIn PDF document text
    • https://thuhuonglacquer.com/uploads/news_file/zonowemip.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/dawuluzalepixat.pdfIn PDF document text
    • https://ms02bet.net/contents/files/mukunawovoxe.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_off0000f142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF142 19284 bytes
SHA-256: 0427f454ee60a570900f53633080129476d5df9a7ad1d15a17b53872206ec421
font_01_sfnt_off000123c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BDB 10548 bytes
SHA-256: 60848dff5110069e550ee28638c26c129b1848d5dd39de43e983d79f01583c51

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