Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f384ffcc1a1a1e9…

MALICIOUS

PDF

33.8 KB Created: 2020-05-23 17:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a45632da1fed799e5af2b0b5c926fe6 SHA-1: f6c36ae31eccb1f9297c3b5cc8498576543c43dd SHA-256: 9f384ffcc1a1a1e9474a3f10a7ed1ca13cab1ff0bc1d4fe2174ac1816ec07bf7
94 Risk Score

Malware Insights

MITRE ATT&CK
T1598 Gathering Victim Identity Information T1204 Malicious Link

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or SEO abuse tactic. The ML classifier strongly flagged this PDF as malicious. The primary intent appears to be directing users to a network of external resources, likely for malicious purposes such as distributing further malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://quisdom.org/uploads/1/3/0/7/130739182/130739182.html#sunbeam+waffle+baker+and+grill
    • http://michoacanarchaeology.com/uploads/1/3/0/9/130969823/kezemiborutofu.pdf
    • http://cairnsmensbreaky.com/uploads/1/3/0/2/130270845/e8bb22d156ac.pdf
    • http://mtuxdesigner.com/uploads/1/3/0/2/130289745/e269cd.pdf
    • http://loveluxury.net/uploads/1/3/0/9/130969628/7276677.pdf
    • http://roobuild.com/uploads/1/3/0/6/130605174/7481706.pdf
    • http://finsswimmingclubstore.org/uploads/1/3/0/6/130621589/9285430.pdf
    • http://fibrowellness.ca/uploads/1/3/0/6/130621552/2210966.pdf
    • http://mjforwardbuild.net/uploads/1/3/0/6/130620604/fivaribe.pdf
    • http://burlingtonrenos.com/uploads/1/3/0/2/130287513/lubez_foxivut_joxajosefaf.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_off00005af2.bin
d01d4490c405e09b6446f226e0176dbf4bac4c8c7cb508a72dd6a706daa6342f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AF2 9764 bytes

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