Malicious PDF — malware analysis report

Static analysis result for SHA-256 1da75836d8714c47…

MALICIOUS

PDF

49.2 KB Created: 2020-04-11 01:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: b334e173da2a92338c3b63d24a3fadea SHA-1: 7c0cda9105097ec6294a7c03b106a18b3f66e494 SHA-256: 1da75836d8714c473299764fca150f4dc9c7d777c1d2963e675f369621903638
96 Risk Score

Malware Insights

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

The PDF file contains a mass of external links, many of which point to PDF files hosted on suspicious domains. The document body, though heavily obfuscated, contains the text 'Crush injury protocol', likely a lure to entice users to click the embedded malicious links. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm designed to direct users to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://adsl-63-204-18-59.benefitplans.org/uploads/1/3/0/5/130589454/130589454.html#crush+injury+protocol PDF link annotation
    • http://lamberthorrorandpopculture.com/uploads/1/3/0/4/130489075/1517521.pdfIn PDF document text
    • http://seventhworld.club/uploads/1/3/1/4/131453343/8b48effc957f43.pdfIn PDF document text
    • http://helpyourselfbulimia.com/uploads/1/3/1/1/131164122/gisunabevifal.pdfIn PDF document text
    • http://mrchadleypw.ca/uploads/1/3/0/5/130550844/8642720.pdfIn PDF document text
    • http://millspondlibrary.com/uploads/1/3/0/3/130313404/4e139250b023dff.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000983c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x983C 8212 bytes
SHA-256: 5f6f174e4d8893806ac9d46e855c4c75a8e9f4ac4cc8e08cece2ac095f323bed

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