Malicious PDF — malware analysis report

Static analysis result for SHA-256 71153094e556bcdb…

MALICIOUS

PDF

42.3 KB Created: 2020-04-17 20:25:45 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b63b98dd3b05b5a5d680ba51e13f97ad SHA-1: a91a76c19aa74aa542e5d51da5c6530f55eea5c0 SHA-256: 71153094e556bcdbf6a699f9cc94520ac09c324b844f0e24c19d59564191ab85
96 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm or SEO manipulation tactic, as indicated by the 'PDF_SEO_LINK_FARM' heuristic firing. It contains numerous external links pointing to other PDF files hosted on various domains. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were explicitly extracted, the presence of embedded URLs suggests a potential for redirecting users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://nataliegmartin.com/uploads/1/3/0/3/130323914/130323914.html#business+letterhead+free
    • http://carollemonrealtors.com/uploads/1/3/0/5/130551311/f1b9fcb72b.pdf
    • http://cleancaloriecooking.com/uploads/1/3/0/4/130435943/sajubow.pdf
    • http://awtaxservices.net/uploads/1/3/0/8/130874403/kajug-kesupokam-lukobujewazukid-puridoxekal.pdf
    • http://myportawash.org/uploads/1/3/1/1/131163732/maxubiwan-nivololumakujiv-lusepabos-sezen.pdf
    • http://manalokris3d.com/uploads/1/3/1/1/131164218/17b50d20bb7dff.pdf
    • http://preijersmak.net/uploads/1/3/0/5/130588443/suzaliwulevo.pdf
    • http://lovebless.net/uploads/1/3/0/6/130604798/3382422.pdf
    • http://internationaltaxlawyerinhouston.com/uploads/1/3/1/4/131407307/xabiroteboxi_zesefuwogoj_powivu_tenupal.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_off00007cb6.bin
082c44b5b0fc5789b59623fc70f461d5b1710e05c623714ab4285f17ad7e7ed4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CB6 8112 bytes

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