Malicious PDF — malware analysis report

Static analysis result for SHA-256 c71333421cf57d86…

MALICIOUS

PDF

37.7 KB Created: 2020-05-19 18:00:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e6ecad59b7213bbd5444b546d0b0701 SHA-1: a86ae3aa48392fe79fc0efc8e6d7105409637130 SHA-256: c71333421cf57d86df7ac2ce966070c4379efcf407ede443ca697ac3bd27f958
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 point to PDF files on various domains, indicating a link farm or SEO spam tactic. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains references to legal text and the URLs themselves are structured to appear as document links, suggesting a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://meshayla.com/uploads/1/3/1/4/131482931/131482931.html#codigo+penal+comentado+pensamiento+penal
    • http://vadenconstruction.com/uploads/1/3/0/7/130775701/zopizugoza.pdf
    • http://tenisslpandalean.com/uploads/1/3/0/5/130540823/mopugor.pdf
    • http://kireilifetherapy.com/uploads/1/3/0/7/130740186/mozukizivexowaw-simatosuzunu-xavasok.pdf
    • http://weddingdjoxfordshire.com/uploads/1/3/0/5/130551210/e04e3d2.pdf
    • http://recordmichigan.com/uploads/1/3/0/9/130969384/3459731.pdf
    • http://puttwellgolf.net/uploads/1/3/0/6/130604314/313256.pdf
    • http://eboniepittman.com/uploads/1/3/0/9/130969798/2038390.pdf
    • http://appvolve.com/uploads/1/3/1/3/131381769/0e4b5d.pdf
    • http://dockwear.com/uploads/1/3/1/4/131437138/00fe934f.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_off000065f1.bin
6d8a0a980762342cefa295bc217569df0421674e33dc44bcfd23cc874f26d986		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65F1 11104 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.