Malicious PDF — malware analysis report

Static analysis result for SHA-256 8991286e4f721095…

MALICIOUS

PDF

37.5 KB Created: 2020-04-12 10:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 4c87132e01562955d7f6525db0f2dbbd SHA-1: de203ecdf253177a7c60bebfeb56f3f136351305 SHA-256: 8991286e4f721095cd55439119ab52ed72b95834d00d475ba5b9b0d2a9572066
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files hosted on similar domains, suggesting a link farm or redirection scheme. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs further supports a malicious intent to redirect the user. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or redirection attack.

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://browlashboutiqueny.com/uploads/1/3/0/7/130739341/130739341.html#mysql+add+index+to+temporary+table
    • http://leestraders.com/uploads/1/3/0/5/130588389/43f432e54.pdf
    • http://beachybathbombs.com/uploads/1/3/0/5/130588763/6b6c8df.pdf
    • http://ldiane.com/uploads/1/3/0/7/130740610/4121895.pdf
    • http://wildteraniafarm.com/uploads/1/3/0/4/130483118/kujibes_gusiv_xamirel_fufemevulutimo.pdf
    • http://chubbypackage.com/uploads/1/3/0/4/130483519/vejagos_gadaxa_gatanitigudepij.pdf
    • http://nebula-it-consulting.com/uploads/1/3/0/8/130874146/921dba4c8ec.pdf
    • http://ison.tech/uploads/1/3/0/7/130740242/5192229.pdf
    • http://atronach.net/uploads/1/3/1/4/131453084/fuwoli.pdf
    • http://sommerfestendingen.ch/uploads/1/3/1/3/131384679/9734691.pdf
    • http://summitshirefarm.com/uploads/1/3/1/4/131454731/0e01059bd5fc13.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_off000069de.bin
4c515eab608f683121af7fe214b151836d9c38106db7b81c129f8aa19a51dbd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69DE 8336 bytes

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