Malicious PDF — malware analysis report

Static analysis result for SHA-256 0034104028f7cd19…

MALICIOUS

PDF

44.9 KB Created: 2020-05-31 10:50:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a634b8724883450eca8cefb06a84eec4 SHA-1: ba3b1f2026a3fc350ee0cd78fd4366a0cec1d7f3 SHA-256: 0034104028f7cd19bb31cec9da044b5338339e223c4c10364ddca77458bb84b7
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to WordPress hosted PDFs with numeric slugs, indicating a link farm designed to manipulate search engine results. The primary malicious URL identified is http://q2.undesirable.us/uploads/1/3/0/2/130271205/130271205.html#warlock+grim+dawn, which is likely used to host a phishing page or distribute further malware. The ML classifier strongly supports the malicious nature of this PDF.

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://q2.undesirable.us/uploads/1/3/0/2/130271205/130271205.html#warlock+grim+dawn
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://muvowovu.files.wordpress.com/2020/05/figukakubivepuw.pdf
    • https://nipatojubob.files.wordpress.com/2020/05/liwozejixijetibo.pdf
    • https://porugisi.files.wordpress.com/2020/05/wakoduvadeniganuwore.pdf
    • https://xibelilunaf.files.wordpress.com/2020/05/21706878043.pdf
    • https://wofopisuf.files.wordpress.com/2020/05/96189793082.pdf
    • https://dasifika.files.wordpress.com/2020/05/35069090552.pdf
    • https://jumitedav.files.wordpress.com/2020/05/buwujefedikaj.pdf
    • https://vajowobago.files.wordpress.com/2020/05/kanagaxozufiwuve.pdf
    • https://xuduzusuma.files.wordpress.com/2020/05/xunozelipaxuve.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://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000081a3.bin
650f95581ab05e144040b08d0557c5835671be6b61f56b37d1a922f2e24b5cf7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81A3 11392 bytes

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