Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9288c50b4949e5f…

MALICIOUS

PDF

52.6 KB Created: 2020-06-05 23:06:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 3c2b32dc66d70707cc0ed2423f947b33 SHA-1: 38e2b6a43a2efe3808aac7c9a804dd26df9a5f2a SHA-256: a9288c50b4949e5fd0d35896529ab7ecc9e11ebd975625646b189b6a2fdb0023
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though heavily obfuscated, contains references to URLs that are also present in the list of extracted URLs. These URLs point to various domains and likely serve as a link farm, potentially for SEO manipulation or to distribute further malicious content. No scripts were extracted, limiting the analysis of direct payload execution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://garysstorage.com/uploads/1/3/0/9/130968921/130968921.html#segunda+ley+de+la+termodinamica+ejercicios+resueltos PDF link annotation
    • http://americanmuffalo.com/uploads/1/3/2/3/132302872/cbe367f2.pdfIn PDF document text
    • http://velvetbathtime.com/uploads/1/3/0/2/130272325/kapibomidip_tetomipokibe.pdfIn PDF document text
    • http://webdisk.greenmountaintreats.com/uploads/1/3/0/5/130590257/jidolebewaga-xileborekigoduk-puzitixogom.pdfIn PDF document text
    • http://monabadawy.net/uploads/1/3/1/8/131859613/ladivuvubader_jumukiwo_xulunoze_varowalik.pdfIn PDF document text
    • http://rongeskeyjr.com/uploads/1/3/0/2/130287257/9f61c0e6582a.pdfIn PDF document text
    • http://viewyoursite.info/uploads/1/3/1/6/131606638/4862762.pdfIn PDF document text
    • http://sarahpoulgrain.com/uploads/1/3/0/3/130379435/gunanol.pdfIn PDF document text
    • http://trinityworshipcenter.net/uploads/1/3/1/4/131407797/sivazajafun.pdfIn PDF document text
    • http://thecurrentcafe.com/uploads/1/3/0/7/130776415/sokuga.pdfIn PDF document text
    • http://vtocmeconf.com/uploads/1/3/1/4/131411147/bda46e0f.pdfIn PDF document text
    • http://plumbing-concepts.com/uploads/1/3/0/6/130603936/negutep.pdfIn PDF document text
    • http://garysstorage.com/uploads/1/3/0/9/130968921/terms.htmlIn PDF document text
    • http://garysstorage.com/uploads/1/3/0/9/130968921/dmca.htmlIn PDF document text
    • http://garysstorage.com/uploads/1/3/0/9/130968921/policy.htmlIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://woxuriro.files.wordpress.com/2020/06/jaloriwemilapugenew.pdfIn PDF document text
    • https://zixipitamefi.files.wordpress.com/2020/06/xumebiziloto.pdfIn PDF document text
    • https://juxudilopi.files.wordpress.com/2020/06/43422201102.pdfIn PDF document text
    • https://zaxidelodawa.files.wordpress.com/2020/06/fesoviwakovurus.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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007a59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A59 2484 bytes
SHA-256: 8085e85f7ab2ec424f2d1e8603e5adaf13eeac0702cda241d6a7218dd8b8c71c
font_01_sfnt_off000084fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84FB 12464 bytes
SHA-256: 1238ad5777cad8be3417bb6e2a4b14ae87515ff95e34596645aaf3144f3dd85b
font_02_sfnt_off0000adf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADF9 16304 bytes
SHA-256: 2ec471bc1dd097ba7445d0d98fae4076614f7d308a936bf5c28a382db3fe60d2

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