Malicious PDF — malware analysis report

Static analysis result for SHA-256 10fcb3bb80f1c806…

MALICIOUS

PDF

35.1 KB Created: 2020-06-23 00:39:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc47d86482d533831255ba68a0c3fa80 SHA-1: 2d0b415540279cf1e298fe618241e64ba0d6f0e1 SHA-256: 10fcb3bb80f1c8067579471bde7b3a58488edc3336968cd6e0364e1b60c90140
96 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, indicating a potential link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs suggests an attempt to direct the user to potentially harmful content. No scripts were extracted, but the overall structure and heuristic firings point to a malicious document designed for user redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://realestateintherockiesevents.com/uploads/1/3/0/5/130590496/130590496.html#quick+and+easy+sunday+school+lessons+for+children
    • http://jeffhohl.com/uploads/1/3/1/0/131071113/7646128.pdf
    • http://azulbendito.net/uploads/1/3/0/4/130436018/vazemavenapimawuzad.pdf
    • http://trainingpupper.com/uploads/1/3/0/6/130621006/8399f8635c335c5.pdf
    • http://1ug.undesirable.us/uploads/1/3/0/5/130539696/kimekug-kabiwedezozumi-vitamefizitovu.pdf
    • http://gotohellsports.com/uploads/1/3/0/7/130740323/7edb4.pdf
    • http://kylejoeturner.com/uploads/1/3/1/4/131407882/355683a68751.pdf
    • http://nofone.net/uploads/1/3/1/6/131606331/6759693.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_off00004cc1.bin
d21268a28786879837f742e11602fe8f20663f5caeadb1b0e83a9d576317a773		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CC1 5140 bytes
font_01_sfnt_off00005e34.bin
22de5bf0580cf6bde520abd51344d9e549ef089cd0c60dd5b308fa8f5eb5bf7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E34 10008 bytes

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