Malicious PDF — malware analysis report

Static analysis result for SHA-256 8240f98cca20d30b…

MALICIOUS

PDF

37.3 KB Created: 2020-06-12 05:13:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 191f34558b247cdfe19ea96e80f50247 SHA-1: d94f020cb438c498577f022513bc43f8932fd4a5 SHA-256: 8240f98cca20d30b357b50c49bd3040b71bca0dacccfacb3d5abe4aa22e1b74d
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to domains that appear to be part of a link farm. The ML classifier strongly indicates maliciousness. The document body, though partially corrupted, contains references to the URLs, suggesting a lure to external content. No scripts were extracted, and the primary malicious activity appears to be the distribution of numerous links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://kelbels.org/uploads/1/3/0/4/130436074/130436074.html#saxon+math+online+worksheets
    • http://orliconsulting.com/uploads/1/3/0/7/130739536/1b045.pdf
    • http://ccamsolutions.com/uploads/1/3/0/5/130543569/ludadiniweki-bireg-raputo-nijoriwowubix.pdf
    • http://betteryouhealthgroup.com/uploads/1/3/1/4/131410818/xawemurekoboxot_tobubuluratud.pdf
    • http://thepizzaplaceandmore.com/uploads/1/3/0/7/130740001/madelesalaxubidi.pdf
    • http://royalsingalongparties.com/uploads/1/3/0/7/130739772/lawiwinovubiju-vijopo-kovurajifefa.pdf
    • http://spuggey.com/uploads/1/3/0/7/130775987/3702523.pdf
    • http://ebricksandmortar.com/uploads/1/3/0/3/130379482/9246293.pdf
    • http://shanenvyhair.com/uploads/1/3/0/7/130776385/keladixuv.pdf
    • http://wealthmgmt.solutions/uploads/1/3/0/6/130639269/gekova.pdf
    • https://sujotupuro.files.wordpress.com/2020/06/67640385982.pdf
    • https://puxeter.files.wordpress.com/2020/06/87797779300.pdf
    • https://jedujasug.files.wordpress.com/2020/06/pesinuk.pdf
    • https://xumitepobeba.files.wordpress.com/2020/06/53117996447.pdf
    • https://zugomesemuz.files.wordpress.com/2020/06/fedixiwugot.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_off000066ec.bin
1bb3720a43a8ac2fd8578cca3fad499514d40f2550179ee14fbc99b2c3938361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66EC 10240 bytes

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