Malicious PDF — malware analysis report

Static analysis result for SHA-256 36fc9ccc502bab9d…

MALICIOUS

PDF

39.0 KB Created: 2020-04-06 04:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ce6b5116c43baa8c26f943190846ada8 SHA-1: 101152bb4da2ba2ef6a1aea09aad7340f3fe6ada SHA-256: 36fc9ccc502bab9d74620a9b34d075a4aaac48b81a071e7381951f904b9f67ac
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 various domains, a technique often used for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to URLs that are part of this link farm, suggesting a coordinated effort to direct traffic to these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://cahayaciptaselaras.com/uploads/1/3/0/7/130739159/130739159.html#como+se+calcula+el+area+de+una+tuberia
    • http://filteredperspective.com/uploads/1/3/1/3/131398497/9145729.pdf
    • http://reviewus-please.shop/uploads/1/3/0/7/130739027/eda584417173a.pdf
    • http://b2bsocialacademy.com/uploads/1/3/0/5/130551106/5038cc.pdf
    • http://anacranebeauty.com/uploads/1/3/1/3/131384260/8285048.pdf
    • http://polarcapcompany.com/uploads/1/3/0/7/130740533/bac34e704.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005936.bin
83ab7d417145cb92ea394869a89a06a59099df28508d9748ccefed8601669c4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5936 7936 bytes
font_01_sfnt_off00007675.bin
985cbd9ba5b629f1b749d04d852c0eecb5d8ad374186a1044a60da9476420dc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7675 2788 bytes
font_02_sfnt_off00008019.bin
885781ec91db75dc8c4a6a3d3dac0324bdfdb8f2239dab70466c62035ae072da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8019 4144 bytes

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