Malicious PDF — malware analysis report

Static analysis result for SHA-256 5349011d9188da1c…

MALICIOUS

PDF

32.5 KB Created: 2020-05-22 02:39:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb9d63086dea682c98997f25bb5ce579 SHA-1: 0a468c397a1c15e4ec847d4207da994286e7f5a5 SHA-256: 5349011d9188da1ce6a3d0acd85501dcd11e9e868738c2f05d4c017143b75ea8
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links to uniquely named PDF files hosted on various domains, indicative of a link farm. The ML classifier strongly flagged this PDF as malicious. The presence of a link farm suggests an attempt to manipulate search engine results or redirect users to malicious content, likely for SEO poisoning or phishing purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://adrenal14.pleasingfood.com/uploads/1/3/1/4/131455328/131455328.html#requiem+for+a+dream+torrent
    • http://permanailsmx.com/uploads/1/3/0/2/130270901/3596887.pdf
    • http://howardshope.net/uploads/1/3/1/4/131437307/e3507b7eee9.pdf
    • http://wedumedia.us/uploads/1/3/0/6/130605289/bapati.pdf
    • http://pjtlaw.com/uploads/1/3/1/0/131070737/lajakugetotuzume.pdf
    • http://oceansexperiment.com/uploads/1/3/0/8/130813357/jitozijavore.pdf
    • http://vizora.org/uploads/1/3/0/4/130483561/2376583.pdf
    • http://snyderagencytx.com/uploads/1/3/2/3/132302809/jazexaz.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_off00005414.bin
0c89896e4aabae90a3dca6a5668b324136f720923f8bbdc3e1d23a7a3112b102		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5414 10404 bytes

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