Malicious PDF — malware analysis report

Static analysis result for SHA-256 17f76942966b4e9c…

MALICIOUS

PDF

43.0 KB Created: 2020-03-30 22:24:02 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3c56ef5b6d45dff6a9096e77bc8710b3 SHA-1: 6ef8e067445b7bc8565c71ab51d1385415e5847d SHA-256: 17f76942966b4e9c43f472098ebaa9522f47885e57313d70b323858fdac5095a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The document body, though partially obfuscated, contains references to URLs such as http://seizediem.com/uploads/1/3/0/4/130476503/130476503.html#stone+of+tears+chapter+summary, suggesting a lure to external content. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent behind 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://seizediem.com/uploads/1/3/0/4/130476503/130476503.html#stone+of+tears+chapter+summary
    • http://haoexpression.net/uploads/1/3/0/7/130738534/1dc63c5b79.pdf
    • http://barclaysbank-online.com/uploads/1/3/0/6/130604737/0449bba3c9a89ad.pdf
    • http://gopanaworld.com/uploads/1/3/0/2/130272478/keranakupilofewe.pdf
    • http://thebusinesscreche.com/uploads/1/3/0/6/130603922/vatuwopo_jakidefevefawux.pdf
    • http://thatonebeautybar.com/uploads/1/3/0/7/130776541/2889433.pdf
    • http://egofloscampi.com/uploads/1/3/0/8/130814871/9059446.pdf
    • http://chictravelmama.com/uploads/1/3/1/4/131407968/6310071.pdf
    • http://otodea.com/uploads/1/3/1/0/131069789/7dbd30228a4c3.pdf
    • http://reddoorcmgroup.com/uploads/1/3/0/3/130313192/vizevolalenijad_vozibevabujin.pdf
    • http://kellyzona.com/uploads/1/3/0/7/130775002/nuzuriruzosaxa_zigagir.pdf
    • http://trinston.net/uploads/1/3/0/6/130620309/5887839.pdf
    • http://aljaca.es/uploads/1/3/0/7/130775827/wefebaxe_sobevalim_tejoji.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://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_off00006bf2.bin
a70f9ef7aa52bd3ad8cf24c0041d27510460c0524ce9166b6c37884edc88372a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BF2 7628 bytes
font_01_sfnt_off000089df.bin
b3affdfdfee497c2d3230853582529cf395d265bfdbb8cde7d84ae9c33602211		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89DF 16036 bytes

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