Malicious PDF — malware analysis report

Static analysis result for SHA-256 98b97fbef0d9a0a7…

MALICIOUS

PDF

39.0 KB Created: 2020-04-04 07:30:52 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 31ea1cdac7002ef658bacb9c4ae8d8da SHA-1: cdf15257a56a58e83ae5b4800183ca4777e1bdd7 SHA-256: 98b97fbef0d9a0a70176f20cfd6c37325bd9edb8057eddc8a2a26d06925194a9
94 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing numerous external links to other PDF documents hosted across various domains. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a mass of external links. The document body, though partially corrupted, contains a URL that is also listed among the external links, suggesting a coordinated effort to direct users to potentially harmful content or manipulate search engine results.

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://idovideophoto.com/uploads/1/3/0/7/130739247/130739247.html#que+diferencias+existen+entre+catabolismo+y+anabolismo
    • http://silentprotagonistgames.com/uploads/1/3/0/2/130289779/ca4c813.pdf
    • http://thepaintladies.com/uploads/1/3/0/5/130550967/zoniwikip-foduwu-belip-rukaw.pdf
    • http://singlebarrelevent.com/uploads/1/3/0/3/130379213/a1a699.pdf
    • http://stevereillylive.com/uploads/1/3/1/4/131483001/tavuregalolaxapanaza.pdf
    • http://imafuckingdracula.com/uploads/1/3/0/5/130538870/sujalurepisaputozi.pdf
    • http://cheveuxlakay.us/uploads/1/3/0/7/130740164/7862865.pdf
    • http://martintg.com/uploads/1/3/0/5/130540240/1003266.pdf
    • http://simyasuaritma.com/uploads/1/3/0/4/130476069/1053175.pdf
    • http://nevo-ins.com/uploads/1/3/0/2/130287311/5641453.pdf
    • http://gmztiresnewandused.com/uploads/1/3/0/7/130776855/41678cee1de7cd.pdf
    • http://wichitapropertyvalues.com/uploads/1/3/0/6/130621530/2543706.pdf
    • http://lighthousechristianacademy1.com/uploads/1/3/0/6/130621460/kofekamamutoderased.pdf
    • http://agawilliams.com/uploads/1/3/1/0/131070762/856b9b7125f9.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_off00006f77.bin
420818a84b662378027b034c9ddc9c1025d0a2c30aab31059e314878c491c310		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F77 8056 bytes

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