Malicious PDF — malware analysis report

Static analysis result for SHA-256 509bce7e68f73050…

MALICIOUS

PDF

42.6 KB Created: 2020-04-06 10:11:31 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: eec2f3476d9f98945ef27a25abcd88a2 SHA-1: a5814cb6afdd1ce3e083a37240bee4558ee0e1f4 SHA-256: 509bce7e68f730505a7fc1b230594d2cc110efe2d247af04d2cc1b71f5eea4ee
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The primary link points to 'http://buanboonaca.com/uploads/1/3/0/6/130621290/130621290.html#pioneer+vsx-819h+hdmi+arc', suggesting a lure for SEO spam or potentially phishing. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://buanboonaca.com/uploads/1/3/0/6/130621290/130621290.html#pioneer+vsx-819h+hdmi+arc
    • http://ithriveco.com/uploads/1/3/0/9/130969080/376c9ba22d5c.pdf
    • http://althees.com/uploads/1/3/0/4/130483956/japuvasajewifokejex.pdf
    • http://norascully.com/uploads/1/3/0/7/130775903/kitowemubagigafosuto.pdf
    • http://dobvideo.com/uploads/1/3/0/3/130379067/c613a0238388bec.pdf
    • http://siobhans.space/uploads/1/3/0/6/130604550/e8dc89ee4.pdf
    • http://thegreenstyleblog.com/uploads/1/3/0/5/130588672/3533980.pdf
    • http://treasureoftheandes.com/uploads/1/3/0/5/130543019/gusovilukoju.pdf
    • http://thirdimapping.com/uploads/1/3/0/7/130738525/6807ebf8.pdf
    • http://wholisticallyhealthy.ca/uploads/1/3/0/5/130539019/vizekoperimaxuf.pdf
    • http://doesitcountasananime.com/uploads/1/3/1/3/131380251/5014443.pdf
    • http://chocolatehairboutique.com/uploads/1/3/0/3/130379319/7866664.pdf
    • http://jogihorse.com/uploads/1/3/0/7/130739103/luzomevuxamevikolelu.pdf
    • http://gordonfaulkner.com/uploads/1/3/0/6/130620674/bivovoxap-lazojewisasevi-pomeja.pdf
    • http://mhlawncarewny.com/uploads/1/3/1/4/131406722/2733650.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_off00007e35.bin
3b7731c674738088a677f196a7c5c6dea360ba0b627f10772cc4d2415d677253		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E35 8332 bytes

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