Malicious PDF — malware analysis report

Static analysis result for SHA-256 63fbe67ce7a8626f…

MALICIOUS

PDF

36.1 KB Created: 2020-05-30 03:32:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3bf0dadf564d47d3a59e54a1c3f52f4 SHA-1: 0241e1db45577a3def01c8014a8ba6c422eca88b SHA-256: 63fbe67ce7a8626f77d542d4df669fd01b3f3e507beec5d66bb7417242b12ea8
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection to malicious content. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the structure and link farm behavior are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://coloradocabinrestoration.org/uploads/1/3/0/7/130739968/130739968.html#how+to+soften+hard+towels
    • http://vftni.org/uploads/1/3/0/2/130270892/b902843aaaf.pdf
    • http://meaningfulplans.org/uploads/1/3/0/3/130379331/596ec3f53d5e88d.pdf
    • http://kelckelly.com/uploads/1/3/1/4/131482968/8717908.pdf
    • http://torreytradingpost.net/uploads/1/3/1/8/131856469/jikisigoda-sikaweke-xogupixafok.pdf
    • http://passionatescentedcandles.com/uploads/1/3/0/6/130639347/jupiku-xigetawux-fukon.pdf
    • http://jensklein.dk/uploads/1/3/0/8/130873986/6e2acae.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000619e.bin
90c11afc8ce426dcabd279a0ff3a7891fe7b84e7f06ca7985b6895f497f6b671		 pdf-font-stream PDF embedded font (sfnt) at offset 0x619E 10664 bytes

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