Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe34678964980bca…

MALICIOUS

PDF

33.1 KB Created: 2020-06-05 23:42:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1fb091be7d6c864f3bc5d3ab0752a60f SHA-1: e9cf85998ba508f5c60e932b6662c41a8c413aaf SHA-256: fe34678964980bca484596467ecc7f4a4d1f9551abe7ae243f2f69f3f66f7998
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links to other PDF files hosted on various domains, a technique often used for SEO poisoning or traffic redirection. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to 'economics principles and practices teacher edition' and the wkhtmltopdf tool, suggesting a lure document. The primary attack pattern involves directing users to a network of potentially malicious or spam-related websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://somersetfoodtrail.org/uploads/1/3/0/8/130814923/130814923.html#glencoe+economics+principles+and+practices+teacher+edition
    • http://krigarewhippets.com/uploads/1/3/0/5/130545742/35a1ee0ab.pdf
    • http://noosaatyourservice.com.au/uploads/1/3/0/2/130289498/63d2f263.pdf
    • http://haddarasales.com/uploads/1/3/0/2/130272853/dd2e46e0e0bc8d.pdf
    • http://localfreshtoyourdoor.org/uploads/1/3/0/8/130873786/d87d8.pdf
    • http://franckinvest.com/uploads/1/3/0/8/130874591/wepujekalagiwi.pdf
    • http://instacsi.com/uploads/1/3/0/6/130603789/kivesukozel-ziwevusuxex-zejepa-bilevuvufukun.pdf
    • http://euniqueblingbar.com/uploads/1/3/0/9/130969830/nirizumipupa_lovasejamadebiw_roxakit.pdf
    • http://priscalia.com/uploads/1/3/0/6/130620819/lotevosunezoso-xisivitedin-poregitakowiwes.pdf
    • http://renecharlesnyc.com/uploads/1/3/0/6/130604061/2918a130fade.pdf
    • http://acementors.org/uploads/1/3/0/4/130476192/zasomixopunemo.pdf
    • http://brioryx.com/uploads/1/3/1/8/131856539/fuzonimabakovujoguko.pdf
    • http://somersetfoodtrail.org/uploads/1/3/0/8/130814923/terms.html
    • http://somersetfoodtrail.org/uploads/1/3/0/8/130814923/dmca.html
    • http://somersetfoodtrail.org/uploads/1/3/0/8/130814923/policy.html
    • https://berilin.files.wordpress.com/2020/06/98878291620.pdf
    • https://gopapuwoko.files.wordpress.com/2020/06/wazibovakatenamigixilak.pdf
    • https://wodanubip.files.wordpress.com/2020/06/bapogigugiwuzaseda.pdf
    • https://rasedapi482319947.files.wordpress.com/2020/06/83549713155.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_off0000571a.bin
c252d97cd426a04d4df2854d0001f9780f2ec39faa99551bb815e7fa14774a6c
pdf-font-stream PDF embedded font (sfnt) at offset 0x571A 9876 bytes