Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9f855f9fae553c5…

MALICIOUS

PDF

37.6 KB Created: 2020-06-07 17:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 571521f21efedd649319f4bb91582d97 SHA-1: 39aa50b8865a536d3ae6f1c0995ceb38708492f9 SHA-256: c9f855f9fae553c54a7a42454ac936c7a3ecbd68cf42efdc04db85c1fa98a94f
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The embedded document body text, though partially corrupted, also contains URLs. These links likely serve to manipulate search engine results or redirect users to malicious content. No scripts were extracted from this sample, limiting further analysis of its direct payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://lamphousecoworking.com/uploads/1/3/1/8/131856333/131856333.html#html+5+ders+notlar%25C4%25B1 PDF link annotation
    • http://sgpt.ca/uploads/1/3/0/6/130621279/f565cef.pdfIn PDF document text
    • http://refresh-holidays.com/uploads/1/3/0/6/130604657/kukozewadig_sijoxopekug_potisera_deligufopa.pdfIn PDF document text
    • http://bepita.ch/uploads/1/3/1/4/131411539/vumitopulazimipagoke.pdfIn PDF document text
    • http://spotithomeinspections.com/uploads/1/3/0/6/130620773/tadobojodeb.pdfIn PDF document text
    • http://cuantifica.com/uploads/1/3/1/0/131069890/5092628.pdfIn PDF document text
    • http://chattanoogacrawlspaceencapsulations.com/uploads/1/3/1/6/131606179/puziwugupovixasut.pdfIn PDF document text
    • http://ldcc.nl/uploads/1/3/0/3/130312984/4012015.pdfIn PDF document text
    • http://doctorfieser.com/uploads/1/3/1/6/131636734/bamudeletudiv.pdfIn PDF document text
    • http://hildegeuens.com/uploads/1/3/0/4/130489128/2688499.pdfIn PDF document text
    • http://pathoftheholyway.org/uploads/1/3/0/6/130604445/medow-kumemodi-jitamemalavi.pdfIn PDF document text
    • http://brittanyciara.com/uploads/1/3/0/7/130740012/6aae5.pdfIn PDF document text
    • http://curbsided.com/uploads/1/3/0/8/130813848/kogalizawulexof-kugaji-zirifux.pdfIn PDF document text
    • http://passionbrandingco.com/uploads/1/3/0/4/130476493/viwanalazug-nezefuked.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fizabisus373515903.files.wordpress.com/2020/06/kadafapeloki.pdfIn PDF document text
    • https://gamumibas.files.wordpress.com/2020/06/57429275480.pdfIn PDF document text
    • https://vikezepe379027054.files.wordpress.com/2020/06/62333766686.pdfIn PDF document text
    • https://pubufifadako.files.wordpress.com/2020/06/14194009689.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

Related samples 1

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

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000633e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x633E 12032 bytes
SHA-256: b82f44ab2d3c1f324339667b09c42ed3d6c50842c9d63bae4ead5fb1eef9ec1f

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