Malicious PDF — malware analysis report

Static analysis result for SHA-256 9660149fca251300…

MALICIOUS

PDF

27.7 KB Created: 2020-06-05 00:18:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 271897fa4742e20c1aa408d6a161401c SHA-1: 6337421ca8a6102312f8982e040f194f980bfd62 SHA-256: 9660149fca25130096dede5134233df45285a94b2dc7e7712dc7354ea701b621
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file was flagged by a machine learning classifier as malicious and contains a large number of external links, characteristic of SEO spam or a link farm. The document body, though partially corrupted, contains keywords related to 'toilet parts' and 'wkhtmltopdf', suggesting a lure to disguise the malicious intent. The embedded URLs likely lead to further malicious content or phishing pages.

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://aventerreecole.com/uploads/1/3/1/3/131379477/131379477.html#mansfield+model+160+toilet+parts
    • http://tierrajusta.com/uploads/1/3/0/7/130738912/datodejozare.pdf
    • http://faithdesignstudio.com/uploads/1/3/1/8/131857284/mexamixaxetanexi.pdf
    • http://amaotaobaodianpuzhuangxiujiaocheng.thesurge.cc/uploads/1/3/0/5/130588548/8442037.pdf
    • http://aventerreecole.com/uploads/1/3/1/3/131379477/terms.html
    • http://aventerreecole.com/uploads/1/3/1/3/131379477/dmca.html
    • http://aventerreecole.com/uploads/1/3/1/3/131379477/policy.html
    • https://fafabozum.files.wordpress.com/2020/06/37108725334.pdf
    • https://wodanubip.files.wordpress.com/2020/06/bapogigugiwuzaseda.pdf
    • https://rizifuto.files.wordpress.com/2020/06/wogosopobunivu.pdf
    • https://mubupowe.files.wordpress.com/2020/06/13115608345.pdf
    • https://lusavorin.files.wordpress.com/2020/06/nepirogufikoz.pdf
    • https://kemimabaz.files.wordpress.com/2020/06/jelaxariwuberurak.pdf
    • https://wovebojabig.files.wordpress.com/2020/06/92497954490.pdf
    • https://zogewuvoxer.files.wordpress.com/2020/06/tuzarefududinilibadu.pdf
    • https://mowatupuj.files.wordpress.com/2020/06/lepepuvaga.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_off0000474d.bin
5e248fb69735228c9220ad6d749ebd72f5a65f05d85911d4cbce8dd1d642d380		 pdf-font-stream PDF embedded font (sfnt) at offset 0x474D 8632 bytes

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