Malicious PDF — malware analysis report

Static analysis result for SHA-256 15e7dd2bfce8b29e…

MALICIOUS

PDF

102.1 KB Created: 2020-04-11 07:31:18 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 4084268bc6b68ee948ebb73c36748909 SHA-1: 539f08ece571e2ee93064d601fa6a761b1a5847f SHA-256: 15e7dd2bfce8b29ee787547cfe8faf8dad2bd8ec5cf885e4a792bb50f767a16b
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to external PDF files, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and the presence of external links suggests a potential distribution mechanism for further malicious content. No scripts were extracted, but the structure and embedded URLs are highly suspicious.

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://74-123-79-26.mgwnet.com/uploads/1/3/0/7/130775756/130775756.html#the+way+of+the+world+full+text
    • http://albeexxxalbee.com/uploads/1/3/0/4/130488580/2741780.pdf
    • http://skillassoundandvision.com/uploads/1/3/0/7/130740356/9d999299.pdf
    • http://stagingandremodeling.com/uploads/1/3/1/4/131483065/3405598.pdf
    • http://runlikepro.com/uploads/1/3/0/8/130873875/d1887901bb0.pdf
    • http://whimsymahjong.com/uploads/1/3/1/1/131164249/sonozafatebi.pdf
    • http://redmansdirt.com/uploads/1/3/0/6/130621450/wufifidipewabomumasi.pdf
    • http://tmow.info/uploads/1/3/1/3/131383427/xizeto_pumenoselu_kijubibokorate.pdf
    • http://wetlandecologybook.com/uploads/1/3/0/8/130874362/muvulin_jelalemuravegun.pdf
    • http://myexoduscounseling.com/uploads/1/3/0/6/130603907/gaxenomukilokulaziz.pdf
    • http://blackwillshoot.com/uploads/1/3/0/5/130590195/pevoveba.pdf
    • http://yogalounge-schweinfurt.com/uploads/1/3/0/5/130550809/396423.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_off00016d47.bin
0771f768da6c2f2961376d3885a515555262fc94bbd1bf15e898901eb4790f7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16D47 7900 bytes

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