Malicious PDF — malware analysis report

Static analysis result for SHA-256 72a3f5efcae4cb41…

MALICIOUS

PDF

41.6 KB Created: 2020-06-04 01:39:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 066ac2abfea394c853c162d5e5efb4ea SHA-1: a979748e41b0e8e4129a16d1ea9b9126382c578f SHA-256: 72a3f5efcae4cb4181b374bf7a4bed276e6bf726c29adc7ffa76245b0b412024
104 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are part of a link farm designed to appear as legitimate content. The ML classifier strongly identified this PDF as malicious, and the presence of a 'download button' heuristic further supports a malicious intent. The document body, though partially corrupted, contains a URL that appears to be a lure for downloading a 'valve hammer texture pack', suggesting a social engineering tactic to trick users into downloading a malicious file.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://agapeassitedliving.com/uploads/1/3/0/8/130874496/130874496.html#valve+hammer+texture+pack+download
    • http://mail.whiskeywineandweather.com/uploads/1/3/1/3/131378791/tototorasefudu-mimotega-wulodukafo-lalurulip.pdf
    • http://2h3.undesirable.us/uploads/1/3/1/4/131454503/betasojenawubub-wopufedeg.pdf
    • http://saltriverlandscaping.com/uploads/1/3/1/4/131407111/vomitutivirowa.pdf
    • http://baobabsouthafrica.com/uploads/1/3/1/3/131380438/fae65b218203b.pdf
    • http://theraverdehealth.com/uploads/1/3/0/2/130288673/nurufovaxafopul.pdf
    • http://ariseandshinephotos.com/uploads/1/3/0/4/130488694/932451.pdf
    • http://agapeassitedliving.com/uploads/1/3/0/8/130874496/terms.html
    • http://agapeassitedliving.com/uploads/1/3/0/8/130874496/dmca.html
    • http://agapeassitedliving.com/uploads/1/3/0/8/130874496/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://pazizeloguk.files.wordpress.com/2020/06/59637143678.pdf
    • https://xaludutalovu.files.wordpress.com/2020/06/fuwujiteponowedonemosik.pdf
    • https://defezanena.files.wordpress.com/2020/06/kulegobarox.pdf
    • https://volurowupif776303697.files.wordpress.com/2020/06/juriwesurukupemubofoxi.pdf
    • https://tamitiji.files.wordpress.com/2020/06/83260989520.pdf
    • https://janolapanak.files.wordpress.com/2020/06/33725899090.pdf
    • https://mitikufit.files.wordpress.com/2020/06/disor.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e95.bin
dc47622888cb4c8ff80995eb10fd397185ae11c2bb11ea68cda36dec05546d29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E95 12176 bytes
font_01_sfnt_off0000858a.bin
29a60492f44b39d68fa00197234d6df9a0cf581d74754725da64c153577ac146		 pdf-font-stream PDF embedded font (sfnt) at offset 0x858A 16132 bytes

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