Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfe21d57c2561166…

MALICIOUS

PDF

40.1 KB Created: 2020-04-01 16:42:40 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: cc2274ecfb131fd222e2c543d3dc5848 SHA-1: 72210ed713569239ca5ab254176893f3791489d8 SHA-256: dfe21d57c25611665209d491ace113772c7464194da8dc33d09db09330eaaa2b
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links to various domains, a technique often used for SEO poisoning or to redirect users to malicious content. The ML classifier strongly indicated maliciousness. The primary attack pattern involves leveraging a link farm of PDF documents hosted on numerous domains, likely to obscure the ultimate destination or to distribute malicious payloads.

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://carzonerepairandbody.com/uploads/1/3/1/4/131406344/131406344.html#manualidades+con+hojas+blancas+paso+a+paso
    • http://rexwilsondesign.com/uploads/1/3/0/6/130639978/3898382.pdf
    • http://peelian.net/uploads/1/3/1/0/131070874/kawegafesafavevujul.pdf
    • http://kilarufoundation.com/uploads/1/3/1/4/131438684/fe0a54b46f55.pdf
    • http://mworhestra.com/uploads/1/3/1/0/131071231/c001c.pdf
    • http://okcyardcards.com/uploads/1/3/0/6/130621847/virewuruxeful.pdf
    • http://5pumpkins.com/uploads/1/3/0/2/130271015/6ae74f9c.pdf
    • http://notyourmothersboutique.com/uploads/1/3/0/6/130620970/48fdf1f.pdf
    • http://heartfulart.shop/uploads/1/3/0/6/130603838/jilevefet.pdf
    • http://praiseeachday.com/uploads/1/3/0/8/130814856/e5d66c.pdf
    • http://www.breannavinsonphotography.com/uploads/1/3/0/6/130639548/c8098fcac347.pdf
    • http://modern-empire.com/uploads/1/3/0/7/130776460/tagipizumalab.pdf
    • http://soulbowl.com/uploads/1/3/0/9/130969391/3922144.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_off00007356.bin
f0db0426558c924c02008585181f2348d9a82184aa23e6cb501883b6468a1494		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7356 8524 bytes

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