Malicious PDF — malware analysis report

Static analysis result for SHA-256 158968c8ef136542…

MALICIOUS

PDF

36.5 KB Created: 2020-05-23 23:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aefb0c6c32cf13f96a494387616fe92b SHA-1: 0408e93f11bbf2b02219c1096b6304e4638032a0 SHA-256: 158968c8ef136542b375a5bbc4ab2039ad0ea242e0a9d07c4512a9764b295051
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The embedded links likely lead to further malicious content or phishing pages, suggesting a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://4v8.undesirable.us/uploads/1/3/0/6/130620578/130620578.html#adding+subtracting+fractions+with+sa
    • http://beingself-centered.com/uploads/1/3/0/7/130739480/1789fd6900.pdf
    • http://enchantingtherapies.com/uploads/1/3/0/5/130551323/cde38fc6fc395.pdf
    • http://bakemecrazyfl.com/uploads/1/3/0/8/130874066/396c19b31fd57.pdf
    • http://nhm-paintingdecorating.com/uploads/1/3/1/4/131437969/aaf548e85b7044b.pdf
    • http://naturalbirthaustralia.org/uploads/1/3/1/6/131636978/rafovu.pdf
    • http://sunnyandblueskies.com/uploads/1/3/1/3/131379301/ladulexe.pdf
    • http://cirlcleofwellnessbymargaret.com/uploads/1/3/0/4/130435846/2641917.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_off0000640a.bin
03e80e458e0cd55c6aedb37f3898811c83b0dccbc3be1dacb4753f6f7e1e77dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x640A 10304 bytes

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