Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5d32fd8e571cb5b…

MALICIOUS

PDF

37.0 KB Created: 2020-04-11 21:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 16b65aa485c134b005177e34d865c960 SHA-1: 0bc717791d38f503cf4597a5517b7b1c44382900 SHA-256: b5d32fd8e571cb5b78011fe607ad5b97758d45e79d2d77a6d385e376f8a7519e
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to similarly structured URLs on various domains. The document body text, though partially corrupted, includes a URL that is also present in the heuristics. This suggests a link farm or redirection mechanism designed to lead users to malicious content. No scripts were extracted, but the extensive use of external links indicates a delivery or redirection strategy.

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://thismaycomeinhandy.com/uploads/1/3/1/4/131408183/131408183.html#will+ve+be+going+to+aras%C4%B1ndaki+fark+konu+anlat%C4%B1m%C4%B1
    • http://evolutionquesttraining.com/uploads/1/3/0/7/130740464/namojeg_sovoturadek.pdf
    • http://littlesilverems.com/uploads/1/3/1/0/131070912/5dd2d8.pdf
    • http://nictehaflordeloto.com/uploads/1/3/0/2/130272851/d8929f.pdf
    • http://focusedqaconsultancyinternational.net/uploads/1/3/0/4/130488700/ea7f96c000b1f9.pdf
    • http://solarmobilitycolorado.com/uploads/1/3/1/4/131437149/zunorotumilujafux.pdf
    • http://enablingyou.com/uploads/1/3/0/6/130639373/538007665.pdf
    • http://mieolaeaster.com/uploads/1/3/0/6/130620795/toguxotimazofinoxe.pdf
    • http://staffari.us/uploads/1/3/0/5/130551739/jepesunobujapetug.pdf
    • http://joshuaosagie.com/uploads/1/3/0/4/130436182/menejalig_rekidofolako_ranox_ximun.pdf
    • http://englishdonewrite.com/uploads/1/3/0/9/130969280/9448941.pdf
    • http://lilisgardenrebloomed.com/uploads/1/3/1/0/131070213/fuduwaputuzerilu.pdf
    • http://englishdonewrite.com/uploads/1/3/0/9/130969280
    • 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_off00006422.bin
c7e8d087e0353fc4c0531512bffeab3bc7417fd04c761529f52cacef78ac3f92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6422 9448 bytes

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