Malicious PDF — malware analysis report

Static analysis result for SHA-256 80b9fee59b5e1cae…

MALICIOUS

PDF

30.0 KB Created: 2020-05-16 19:51:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 150d43f0a609d033555d2a7500da9533 SHA-1: 0ff74d14ded6b8b6ba67718f075ebcdaf9676489 SHA-256: 80b9fee59b5e1cae8a8bf32dfc93816212f7a076744ab85b63daac40561bc540
104 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many of which point to other PDF files hosted on unrelated domains. This behavior is indicative of a link farm designed to host and distribute malicious payloads or to manipulate search engine rankings. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trioboemboes.com/uploads/1/3/0/6/130604752/130604752.html#lab+assistant+2018+answer+key
    • http://carriewears.com/uploads/1/3/0/5/130551477/a0456.pdf
    • http://lovegoddessamber.com/uploads/1/3/0/5/130545954/nitokukogawediwomoz.pdf
    • http://bsatroop510.org/uploads/1/3/1/4/131411600/zogifiviro.pdf
    • http://veteransforlife.net/uploads/1/3/0/7/130739431/tasuvelukew.pdf
    • http://steveatkinsondesign.com/uploads/1/3/0/3/130313141/wuxogajuvekux.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off00004b3b.bin
ac177e93cb342b742a20f4aeef9f4dad92141aed271416a4b580baf1e31ad5b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B3B 10136 bytes

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