Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d2ce775caaeea38…

MALICIOUS

PDF

32.4 KB Created: 2020-06-03 01:12:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7ffd2da9b4702001bfae34114f78ad3 SHA-1: f611c89e8f47157e57426aa46e02980496af1348 SHA-256: 3d2ce775caaeea38938b525052719767b1be87e784a094a081e707be466c0db1
94 Risk Score

Malware Insights

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

The PDF document was flagged by an ML classifier as malicious with high confidence. It contains a significant number of external links, many pointing to domains that appear to be part of a link farm. The primary purpose seems to be SEO manipulation or redirecting users to potentially harmful content, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. No scripts were extracted, limiting the analysis of direct payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nareniciacte.com/uploads/1/3/0/9/130969357/130969357.html#bmr+assignment+4+answers
    • http://getcherry.app/uploads/1/3/0/6/130639467/givelusow-lefosip.pdf
    • http://terribeuthin.com/uploads/1/3/0/2/130288363/pagexa.pdf
    • http://francescabackhouseillustration.com/uploads/1/3/1/8/131871849/goviwakes.pdf
    • http://nareniciacte.com/uploads/1/3/0/9/130969357/terms.html
    • http://nareniciacte.com/uploads/1/3/0/9/130969357/dmca.html
    • http://nareniciacte.com/uploads/1/3/0/9/130969357/policy.html
    • https://kumoxiv.files.wordpress.com/2020/05/25053635295.pdf
    • https://judexinumo.files.wordpress.com/2020/05/wafepipubinezitet.pdf
    • https://pefewakafoba.files.wordpress.com/2020/05/poduwanumor.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_off000053c4.bin
467402ce6b1d0a4bb575a8cba3ca040a7f3387f9e8d9947a2dfc060a5525ef36		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53C4 10272 bytes

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