Malicious PDF — malware analysis report

Static analysis result for SHA-256 f624b4145bfc3398…

MALICIOUS

PDF

46.9 KB Created: 2020-04-21 20:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: cce3e32e9be20aae16a442aa55ab540b SHA-1: 54d6faa6cd314024b6031a9b38dee17a0cd4ae1b SHA-256: f624b4145bfc33987a4566b910624346602d5580a54bd546647cac401cfad3c4
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, many of which point to domains structured for SEO manipulation. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a link farm. The embedded URL and the document body text also point to external resources, suggesting a lure to redirect users to potentially malicious content hosted on these domains. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://norakeys.com/uploads/1/3/0/8/130814448/130814448.html#algernon+blackwood+the+wendigo+pdf
    • http://sweetjoys.info/uploads/1/3/0/2/130270907/2396905.pdf
    • http://mrseafoodrestaurant.com/uploads/1/3/0/6/130621588/sujedufojopuxurapes.pdf
    • http://gas-p.com/uploads/1/3/0/5/130543787/2381783.pdf
    • http://thatspecial.co/uploads/1/3/0/2/130272591/lutubakoximo.pdf
    • http://purveyorofpretty.com/uploads/1/3/0/3/130313590/bugevulepi_tuxofafeka_fabolu.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_off0000905c.bin
1fb00c01b383c30efabd849068c0f99ff32ea2d5840756086f96d4902c3dbba8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x905C 8268 bytes

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