Malicious PDF — malware analysis report

Static analysis result for SHA-256 31c68d89eb588935…

MALICIOUS

PDF

41.3 KB Created: 2020-05-22 00:53:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0fdfb71bed69431b9aaa0e80df38c506 SHA-1: 6b97aa19a82579939389d8c19e3d674b6aa1f720 SHA-256: 31c68d89eb58893511a31b55b136adac0cb2c4d4a3a2f2f701dd77c718b33ea1
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body text, though partially corrupted, includes a URL that is also present in the list of extracted URLs. This suggests the document's primary purpose is to redirect users to a network of websites, likely for SEO spam or to host further malicious content. No scripts were extracted from this sample.

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://nobuhotelmarbella.devsite-1.com/uploads/1/3/0/5/130590205/130590205.html#learn+and+master+piano+pdf
    • http://wordsmith-sg.com/uploads/1/3/1/6/131606954/nikujawi.pdf
    • http://hostmaster.bluesicxtarot.co.uk/uploads/1/3/0/5/130588248/1e35a.pdf
    • http://domicilia2.com/uploads/1/3/0/7/130775382/tikomisa.pdf
    • http://soubookkeepingandtaxessolutions.com/uploads/1/3/0/5/130551675/tazoxiwuku.pdf
    • http://christbook.org/uploads/1/3/0/7/130775196/dagideb-ritakodiratos-podaji.pdf
    • http://bayadapediadtricswlm.com/uploads/1/3/0/9/130969209/7089169.pdf
    • http://elseorganizing.com/uploads/1/3/0/7/130738963/dafegovoxixiwajokoz.pdf
    • http://advantagebuildingmaintenance.net/uploads/1/3/0/7/130775189/pojulefujitoga.pdf
    • http://thecollectionbysafari.com/uploads/1/3/0/6/130621304/597698.pdf
    • http://seraphimatx.com/uploads/1/3/1/3/131398374/7293126.pdf
    • http://perezwitt.com/uploads/1/3/0/5/130589427/lekijokuwixagibodom.pdf
    • http://mecaservices44.fr/uploads/1/3/0/5/130551417/d95d23b62c11127.pdf
    • http://3axisphotography.com/uploads/1/3/0/5/130551390/1399ef2f848.pdf
    • http://drippingspringsroofrepair.net/uploads/1/3/1/4/131406582/pemidavipevem-jonukokevujokab-xofulezodos.pdf
    • http://dunskyimmigration.com/uploads/1/3/0/6/130604373/bepemiso.pdf
    • http://coaching2catapult.com/uploads/1/3/1/4/131407423/e0838.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066ee.bin
7650466656b9240ab3779d9735e7e327117c5a45d84582a4ffca341019b70402		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66EE 22836 bytes

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