Malicious PDF — malware analysis report

Static analysis result for SHA-256 f42b01ec6b55f55d…

MALICIOUS

PDF

38.1 KB Created: 2020-06-17 02:26:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 284c308b491c2ac8639ff4145b852826 SHA-1: 9564166e09aeacecb0ec0750cb8431490ed80d0d SHA-256: f42b01ec6b55f55d89141c7da70bb65acc92367b578d144df083acf57af5bc9f
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, a technique often used for SEO manipulation or to distribute further malicious content. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the extensive link farm suggests a delivery mechanism for potentially harmful content.

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://sprinklesweets.com/uploads/1/3/0/2/130273578/130273578.html#topps+hockey+card+price+guide
    • http://new.iprwyoming.org/uploads/1/3/1/4/131456320/lidimusimaropibomo.pdf
    • http://stevebolanderart.com/uploads/1/3/0/6/130640053/55ce5.pdf
    • http://naomistyleboutique.org/uploads/1/3/0/3/130324152/9bef4ba.pdf
    • http://casitadeluz.net/uploads/1/3/1/4/131453222/fa463653fd48.pdf
    • http://74-123-77-127.mgwnet.com/uploads/1/3/1/4/131453588/8513938.pdf
    • http://pawsitivevibesart.com/uploads/1/3/0/7/130738542/06b9a6e2db3c5.pdf
    • http://craftbruz.com/uploads/1/3/1/4/131407005/sisevep.pdf
    • http://danvillepulmonaryclinic.com/uploads/1/3/0/3/130379430/8513086.pdf
    • http://hostmaster.whitstablefringe.co.uk/uploads/1/3/1/4/131409574/09f1c4.pdf
    • http://photographsandmemories.org/uploads/1/3/2/6/132696128/8530990.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000586f.bin
93f03cb110a0063cfcd5ef77792b86a23ae83b1429f4532e3148237fb5a6b51c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x586F 5112 bytes
font_01_sfnt_off000069ea.bin
c8967a006573b4f5a84d91fd9d94abeeb87e56baf89480024fd17df6a4793f12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69EA 10176 bytes

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