Malicious PDF — malware analysis report

Static analysis result for SHA-256 8579de7c9f58b380…

MALICIOUS

PDF

39.3 KB Created: 2020-03-30 03:43:40 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 9964bb4d6fd3f5507ea6e90d7128158f SHA-1: 59e2b85631c80712515f4e510dd54825f170c162 SHA-256: 8579de7c9f58b38034e6fd315b7ab95c7ef72cd0496aea8f4a17b8964f5821a8
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the presence of numerous links suggests an attempt to redirect users to malicious sites, potentially for phishing or malware distribution. The document body contains garbled text and what appears to be metadata, but the primary malicious activity is inferred from the link farm.

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://cpanel.ladse.org/uploads/1/3/0/5/130551704/130551704.html#present+perfect+conjugation+irregulars
    • http://golfmissiontrips.com/uploads/1/3/0/6/130604004/kebavobo.pdf
    • http://ns1.chicoanimalshelter.org/uploads/1/3/0/7/130740251/5f757c7c6a.pdf
    • http://achintconsultinginc.com/uploads/1/3/0/4/130476270/5431491.pdf
    • http://highschoolsportsperformance.com/uploads/1/3/0/7/130775154/7085ea748.pdf
    • http://lucedutoit.com/uploads/1/3/0/8/130874053/sinoj_bupesodumujar.pdf
    • http://djcarpet.net/uploads/1/3/0/4/130476327/jaxovaxurovem.pdf
    • http://cathyhepworth.com/uploads/1/3/1/4/131408027/mugam_fobijo.pdf
    • http://safeandsecureinc.org/uploads/1/3/0/2/130272616/3370373.pdf
    • http://cureeventsproudlysupportingbeyondblue.com/uploads/1/3/0/4/130476004/gopurewoxafadit.pdf
    • http://diversified-resources.org/uploads/1/3/0/7/130775461/8512475.pdf
    • http://gregster60.com/uploads/1/3/0/6/130603702/3cb8d4d0405ced0.pdf
    • http://bartowwinds.org/uploads/1/3/0/3/130313641/bofin_jikad_zidokej_nepifaxufimokod.pdf
    • http://propelautomotive.com/uploads/1/3/0/5/130590564/buwes.pdf
    • http://andrewmcgeown.com/uploads/1/3/0/5/130550898/ludovadiput_jugomasasukox_zanedit.pdf
    • http://realestateroundtablediscussions.com/uploads/1/3/1/0/131070376/70712dfc.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_off00006f64.bin
b59c8a32a272607ed9aba348e764d7f5189643cc1ce111383d4fea4531813680		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F64 8888 bytes

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