Malicious PDF — malware analysis report

Static analysis result for SHA-256 95d5667449248c53…

MALICIOUS

PDF

38.1 KB Created: 2020-04-13 06:37:50 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f617a3da68a32fabd60bdd6aefe938d3 SHA-1: 923b5b0d72b8abc801723fb7110b85a083705464 SHA-256: 95d5667449248c53a9dbb984df4804116ef1dde38c7de7fc50ea86c9921510d0
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are numerically or generically named, suggesting a link farm or SEO abuse tactic. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a movie cover. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves directing users to malicious external sites via embedded links.

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://aaointernational.com/uploads/1/3/0/5/130589048/130589048.html#me+before+you+book+movie+cover
    • http://grunt365.com/uploads/1/3/1/4/131453650/871c40.pdf
    • http://gps-music.com/uploads/1/3/1/3/131398582/26143934a53f223.pdf
    • http://agmetalworx.com/uploads/1/3/0/7/130739086/fbf95b8b9.pdf
    • http://womenheartwestdenver.com/uploads/1/3/1/4/131409546/nawojo.pdf
    • http://cdtaleadership.com/uploads/1/3/0/2/130272496/c979f9.pdf
    • http://c9concepts.com/uploads/1/3/1/4/131437871/385691.pdf
    • http://jamisonchesterfox.com/uploads/1/3/1/3/131382148/1569c5cc391.pdf
    • http://bryanwalton.com/uploads/1/3/1/1/131164063/wesurepasunoj-dudijidib.pdf
    • http://crosswindschurchmorenovalley.org/uploads/1/3/1/4/131406060/683094.pdf
    • http://kalamazoodistilling.com/uploads/1/3/0/6/130620660/pamudapupog-fekale-lakusapapudi.pdf
    • http://mrorejel.info/uploads/1/3/1/1/131163634/pizotem.pdf
    • http://classiccityfirewood.com/uploads/1/3/0/9/130969312/722331.pdf
    • http://thegizdc.com/uploads/1/3/1/3/131380308/xowokosupupi.pdf
    • http://buddaclothing.com/uploads/1/3/0/4/130483263/3665117.pdf
    • http://classiccityfirewood.com/uploads/1/3/0/9/130969312/7
    • 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_off00006bc2.bin
2b090b27c0b8bd2691ac43623afea3d7f12569f5a4aa56bc3aba7c5520fad26a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BC2 7984 bytes

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