Malicious PDF — malware analysis report

Static analysis result for SHA-256 718f6c41282378ce…

MALICIOUS

PDF

36.1 KB Created: 2020-06-25 02:44:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 40d4d321d9fe9fa3f9bda070acb10bb4 SHA-1: 8bbf7e2c75be7206c82a6d34d1b54d6c578b40a4 SHA-256: 718f6c41282378ce337b65fcb96af200fe3b6491d7ec3829196f82d44c2b2895
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to other PDF files hosted on suspicious domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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://aelmorris.com/uploads/1/3/1/6/131636978/131636978.html#chemistry+principles+and+reactions+answers
    • http://adventuresofdhofar.com/uploads/1/3/1/4/131438517/f60423a.pdf
    • http://webmail.hansenrestoration.com/uploads/1/3/0/7/130740133/simepebigowinab-sutefewolez.pdf
    • http://computersconsultant.com/uploads/1/3/2/6/132681861/rixadami.pdf
    • http://covid-mask.com/uploads/1/3/0/9/130969454/fewufisam.pdf
    • http://mx.artur-v.com/uploads/1/3/0/5/130545581/f9c5ab3151.pdf
    • http://rimasrl.facile.hosting/uploads/1/3/0/4/130492038/2679364.pdf
    • http://theroyalapartment.com/uploads/1/3/1/3/131380349/5658599.pdf
    • http://spicesdownunder.com/uploads/1/3/0/7/130740027/zusuxiruj_tafigoxapekeno.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004d0a.bin
847d5ad089d8106b0e261864ff0c62b766f3c9e0691b5bc0550a201c5837c64e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D0A 5316 bytes
font_01_sfnt_off00005f07.bin
b4c47adcc86e527f4d1d7d162779e141c1f44f93c13c1c18f94797cd268c8386		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F07 10908 bytes

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