Malicious PDF — malware analysis report

Static analysis result for SHA-256 6531b9f1cde9f263…

MALICIOUS

PDF

33.4 KB Created: 2020-06-16 06:50:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 64f601fb3fc0c3b3ba3c4bfda6e8dccf SHA-1: 38612d3e81561be3a0e506ac30a26c10d64ecee4 SHA-256: 6531b9f1cde9f26300c0b56c5e76379f0f975d4e51ba5234f878147aad287a88
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The embedded document body also contains multiple URLs, suggesting a malicious intent to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the nature of the link farm and the ML classifier's high confidence indicate a malicious document, likely used for SEO spam or distributing further malware.

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://happybirthdayhasna.me/uploads/1/3/0/7/130738913/130738913.html#singing+lessons+in+hong+kong
    • http://sarahbagwelllaw.com/uploads/1/3/1/8/131857431/vetifitojolikanufi.pdf
    • http://mx.rlccoop.com/uploads/1/3/0/5/130543877/1737637.pdf
    • http://sundry.moisescastro.com/uploads/1/3/1/0/131071176/9095568.pdf
    • http://mail.motherwolfsoulandbody.com/uploads/1/3/1/3/131379398/4801790.pdf
    • http://green-soleil.com/uploads/1/3/1/3/131383838/c456daf90.pdf
    • http://thesportsintuition.com/uploads/1/3/0/5/130551106/jetudu-lojunisexikafak.pdf
    • http://fatbouyadvancedriding.co.uk/uploads/1/3/1/3/131398231/lejirej_dugowi_jumowoxumodo.pdf
    • http://blank-ksa.com/uploads/1/3/1/0/131070213/247000b60221.pdf
    • http://gselectric.org/uploads/1/3/1/3/131397940/ramepanemisevi_zunitukuziv_govovabajunijat_fizozapodamob.pdf
    • http://daree2be.com/uploads/1/3/1/3/131380029/3d2153.pdf
    • http://afrodigitalinvasion.co.za/uploads/1/3/1/3/131382841/da6f0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000057cd.bin
928fd78f2ed733b076a5cca47fb3752de35b94b63571264f11c6548d1ee0b153		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57CD 10208 bytes

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