Malicious PDF — malware analysis report

Static analysis result for SHA-256 349540cb4ef0bbf1…

MALICIOUS

PDF

81.7 KB Created: 2021-09-17 22:21:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5df8f333e8ad16f96d416cebd7569de8 SHA-1: cfb6113bc3482686f11b2a1aaa01b1188f5f15f7 SHA-256: 349540cb4ef0bbf126aad86663664a535dc268e55dccc77bb3df321f05778166
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and the link farm heuristic point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=super+mario+bros+hack+download PDF link annotation
    • http://vrzion.com/data/userfiles/files/4071900519.pdfIn PDF document text
    • http://didopack.com/files/63694965565.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/dumowemuzusa.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/vagulirojejodozofusomakus.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138195c7e499---jumakudoroboxipixowevob.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/8773466719.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135f1b18d1ef---14985092086.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/fogivijudowiworozid.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/92042386292.pdfIn PDF document text
    • http://evola.it/userfiles/files/89571800603.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/lezomodut.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/muvolorewofalowewo.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/xiboxanudi.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/pejesukopuzitowawasozup.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/denup.pdfIn PDF document text
    • https://asi-filter.pl/files/file/65725266403.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021090905552096.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/61630893386.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/93697307439.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/xasewanevuvagajida.pdfIn PDF document text
    • https://superpart.com/files/33456027075.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/71928237000.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/dezexorabevikixirevakomes.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/22312124775.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/57521221222.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_off0000d5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F4 18616 bytes
SHA-256: 6bad93cc07d82aeefedfbdc1c717d8d90f5887be60389e32ac516154701e00e1
font_01_sfnt_off000106e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011eff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFF 11176 bytes
SHA-256: 7b85a9bc0e2b09afe10633e71586e199700091258030b61c0a507fcf942d60b2

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