Malicious PDF — malware analysis report

Static analysis result for SHA-256 65893dcf12621661…

MALICIOUS

PDF

35.7 KB Created: 2020-04-10 04:30:41 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b88ea1c8ff8387fa2ca077acf70b44ed SHA-1: bba94edfdd848a0983bf5b5d917543671dc93d40 SHA-256: 65893dcf126216615cac70a993a0222eb487ddb2aebebce34e2f973cc2c0fd81
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to various domains, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though heavily obfuscated, contains references to URLs that are also present in the extracted URL list. This suggests the primary purpose is to direct users to a network of linked content, likely for malicious purposes such as SEO spam or malware distribution.

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://bmphotographer.com/uploads/1/3/0/3/130379163/130379163.html#tuesdays+with+morrie+review+new+york+times
    • http://diracommunity.com/uploads/1/3/0/6/130620778/2445008.pdf
    • http://novelgd.com/uploads/1/3/0/5/130539004/roxelexegofa.pdf
    • http://undergroundinc.info/uploads/1/3/0/4/130490476/davilosid.pdf
    • http://pathlightpartners.com/uploads/1/3/0/3/130323622/c1ced6b5c222e0.pdf
    • http://yogaforvitalitywithashton.com/uploads/1/3/0/6/130640128/2121091.pdf
    • http://primerealtygroup.biz/uploads/1/3/0/2/130272426/2351778.pdf
    • http://trbutcher.com/uploads/1/3/0/4/130489386/85110f7f6adcb.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_off00006340.bin
6ca84bcdac2c49dd4c962abd2d91b24051afe19b9c6cd7d9dff76be408b5e7e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6340 7908 bytes

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