Malicious PDF — malware analysis report

Static analysis result for SHA-256 77b8961edc9e6e13…

MALICIOUS

PDF

37.6 KB Created: 2020-06-07 03:02:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 485c03946238f4bc56ec6e62569c09eb SHA-1: 50cb19c9ca5af6aaabb20dd033814657d83c8291 SHA-256: 77b8961edc9e6e132ecf078f7dc6c38ea60f061253cda90097f5903b9546e626
96 Risk Score

Malware Insights

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

The PDF document contains numerous external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a tactic to generate traffic or distribute malicious content. The document body, though partially corrupted, contains a URL that appears to be a lure for downloading movie files. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://gl.eliteedu.org/uploads/1/3/1/6/131606183/131606183.html#lady+and+the+tramp+full+movie+download
    • http://supernew.eu/uploads/1/3/0/7/130775969/9884379.pdf
    • http://hostmaster.canal-art-by-julie.co.uk/uploads/1/3/0/2/130270869/c9c70d7471.pdf
    • http://georgesgardenforgood.com/uploads/1/3/0/2/130287536/sakozobazaginaw-bupobu-tazalemak.pdf
    • http://hope4indianola.com/uploads/1/3/2/3/132302919/gekajuwasusun.pdf
    • http://webmail.summitridgeguides.com/uploads/1/3/1/3/131398489/wezivuxebu.pdf
    • http://hostmaster.storiesfromtheroad.de/uploads/1/3/0/9/130969981/vebabe.pdf
    • http://cando.xyz/uploads/1/3/0/6/130639508/xabugarozenet.pdf
    • http://chelsealeis.com/uploads/1/3/0/4/130477839/9f3fb1bf.pdf
    • http://dennergroup-mobile.com/uploads/1/3/0/2/130289474/nekefufax.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.fontrix.comhttp://www.nhncorp.com
    • https://pewinutol.files.wordpress.com/2020/06/zalularakuzadivijigakaz.pdf
    • https://nipatojubob.files.wordpress.com/2020/06/38602788718.pdf
    • https://bewenaxo.files.wordpress.com/2020/06/fatiz.pdf
    • https://lixogobofa.files.wordpress.com/2020/06/xibijuxuzudukojojuvomusaj.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d87.bin
6754cf94c455f501950cc5547d93a4ea97f9ecd8c61f6e5bf0da7b1ca301677e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D87 10540 bytes
font_01_sfnt_off000081b4.bin
e56f5db8faf554166087922806b3819c377976d94af14c6b8a512386de68c265		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81B4 2056 bytes

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