Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c10e4ab29474c49…

MALICIOUS

PDF

29.5 KB Created: 2020-04-08 08:15:21 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d39da7a82096cd86d648d0d04fffe2c6 SHA-1: 8046e544571b542ef50e4b7a27e6b227d7429e96 SHA-256: 9c10e4ab29474c495e09792acad7ee2a0ae402f6c155dd252086193ac34e0521
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, a technique commonly used for SEO manipulation or to distribute further malicious content. The ML classifier strongly flagged this PDF as malicious. The embedded document body text, though partially corrupted, contains a URL that mirrors the structure of other links found in the document, suggesting a coordinated effort to link to numerous PDF files.

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://geluksopleiding.nl/uploads/1/3/1/4/131437622/131437622.html#toshiba+satellite+l655-s5150+hard+drive+replacement
    • http://laurenvanmullem.com/uploads/1/3/1/3/131380870/4926467.pdf
    • http://aaice.org/uploads/1/3/1/3/131380606/dixekiverisijon.pdf
    • http://positiefsamenwerken.info/uploads/1/3/1/3/131379478/sosixexivazifafebe.pdf
    • http://stumblingmonkeydecals.com/uploads/1/3/1/3/131383464/7267856.pdf
    • http://fwclifestyle.com/uploads/1/3/0/4/130435544/2727065.pdf
    • http://dalmaresproduce.net/uploads/1/3/0/4/130435511/420285.pdf
    • http://nissajackman.org/uploads/1/3/0/4/130476652/6121089.pdf
    • http://starruchii.com/uploads/1/3/0/6/130605381/7182242.pdf
    • http://alliedassetdocumentation.com/uploads/1/3/0/6/130604141/5570824.pdf
    • http://coachlizonline.com/uploads/1/3/1/4/131406744/1393914.pdf
    • http://seafoodfestivalgiveaways.com/uploads/1/3/1/4/131453464/95c6dce49b.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_off00004ef3.bin
46cdb6ea38f0699b75862d1ed3af260201d0486bb21414fdaae8c5e9d3e7d2bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4EF3 6412 bytes

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