Malicious PDF — malware analysis report

Static analysis result for SHA-256 04b8c66165a5bc07…

MALICIOUS

PDF

40.1 KB Created: 2020-03-07 11:56:16 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b46225fdfda8c886d4f6ecaebe90fec9 SHA-1: eb69d7c5e2750d94c4de7d8cd503bddd2a43faa2 SHA-256: 04b8c66165a5bc074bb2c77d2e7d2e09ea5b4399ded47403a2d899947eebec8f
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or distribution network. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and the sheer volume of outbound links suggest an attempt to manipulate search engine results or distribute malicious payloads. The document body contains what appears to be obfuscated text and URLs.

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://shop.blackgawd.com/uploads/1/3/0/5/130588880/130588880.html#a+wrinkle+in+time+chapter+5+questions+and+answers
    • http://joelleprevost.com/uploads/1/3/0/2/130288333/vatumuli.pdf
    • http://alittleactofkindness.com/uploads/1/3/0/7/130776725/00b4c3a52c.pdf
    • http://chicagotoeflschool.com/uploads/1/3/0/5/130552084/6959698.pdf
    • http://learnmycamera.com/uploads/1/3/0/4/130488370/a1c223da3.pdf
    • http://www.thegrangeguesthouse.net/uploads/1/3/0/7/130739974/10b7327d8a45095.pdf
    • http://ronsidwell.com/uploads/1/3/0/6/130620653/wiganepatiseva_wobotox_detizosafenewo.pdf
    • http://mahgdalenrose.com/uploads/1/3/0/9/130969726/mopatituvegovupevu.pdf
    • http://kamao.org/uploads/1/3/0/2/130289166/806d631.pdf
    • http://allkindsofthingsstore.com/uploads/1/3/0/4/130436017/7844092.pdf
    • http://mystiks808.com/uploads/1/3/0/5/130589308/jevanum.pdf
    • http://lovacollection.com/uploads/1/3/0/9/130969853/gisanotebovem.pdf
    • http://mollymeesterdesigns.com/uploads/1/3/0/7/130776212/wedogodi.pdf
    • http://pinestschool.com/uploads/1/3/0/4/130475921/fizopevigari.pdf
    • http://mta-sts.eweaonline.org/uploads/1/3/0/5/130589229/5801578.pdf
    • http://www.grandmajuel.com/uploads/1/3/0/5/130589354/df623.pdf
    • http://www.marsharivera.com/uploads/1/3/0/2/130291646/6485863.pdf
    • http://urdumitra.com/uploads/1/3/0/5/130550664/225508.pdf
    • http://myhappyeverydaylife.com/uploads/1/3/0/6/130620603/3812090.pdf
    • http://hallstaxservice.com/uploads/1/3/0/6/130605314/buzake.pdf
    • http://www.thelittlethingsbykate.com/uploads/1/3/0/7/130776319/e731b.pdf
    • http://myelegancejewelryaccessories.com/uploads/1/3/0/8/130874300/644e62e3f03c.pdf
    • http://www.baskinrobbinsfranchising.com.au/uploads/1/3/0/5/130588277/4e760d375b.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_off0000732b.bin
162c544d603848b52465c9f5e9720305dec4e0968c7e1b959c224f32e17689cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x732B 8072 bytes

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