Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d91780efc55ca79…

MALICIOUS

PDF

42.3 KB Created: 2020-04-10 18:16:58 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c9aefc847be72760fdeab795051b93fc SHA-1: e5adf180e7c06adc139751f64f3c30e9d1e936c0 SHA-256: 7d91780efc55ca796a1fc4baf4a7643276ab78c094f0b18407594d3ca33ada57
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs suggests an attempt to direct users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and URL distribution are indicative of a phishing or content-luring attack.

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://5pointauto.com/uploads/1/3/0/9/130969954/130969954.html#man+of+the+house+veronica+walkthrough
    • http://santacruzsoaps.com/uploads/1/3/1/6/131606066/3413954.pdf
    • http://jerrygarciamusic.com/uploads/1/3/0/3/130379075/66993b79aa7.pdf
    • http://kingedwardscorner.com/uploads/1/3/0/2/130288599/zafatuduzu_zelifor_nanipug.pdf
    • http://almfloor.com/uploads/1/3/0/3/130323888/e098c0c.pdf
    • http://abundantly-healthy.com/uploads/1/3/1/3/131380759/877798.pdf
    • http://institutohug.com/uploads/1/3/0/7/130738506/vumimufetigus.pdf
    • http://miesco.net/uploads/1/3/0/4/130488565/4955367.pdf
    • http://allenharvey.com/uploads/1/3/0/5/130551155/32ae8.pdf
    • http://bravopolo.org/uploads/1/3/0/4/130483871/ec5e942f4.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006651.bin
16f78d2f8d4cd390764efb0c364fc02879f2c378e3dc9a22a2a0d0a8378e2515		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6651 8532 bytes
font_01_sfnt_off00008729.bin
fc0bcc9d08d908b8b1287d0ab2df4e3a5be78b1d1690d8efe3ff9d2c54ab5679		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8729 16064 bytes

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