Malicious PDF — malware analysis report

Static analysis result for SHA-256 159fc3ebf58a3f2d…

MALICIOUS

PDF

36.4 KB Created: 2020-06-14 13:38:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 326a630919cd403c3f9930c45c86f876 SHA-1: 226044cdf1103097f088971a16a6e0418eee9c65 SHA-256: 159fc3ebf58a3f2de012d32b07898561c2a563036e335213ad0aba6058e8d1c6
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO spam attack. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the embedded URLs are the primary indicators of malicious activity, likely directing users to potentially harmful content or further stages of an attack.

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://cpanel.enchantedcakesandtreats.com/uploads/1/3/1/4/131437655/131437655.html#corrente+continua+e+alternada+pdf
    • http://avalonflyfishing.com/uploads/1/3/1/4/131453096/jewizu.pdf
    • http://ramagick.com/uploads/1/3/1/4/131437880/fa8d56.pdf
    • http://mister5foot18.com/uploads/1/3/1/3/131381240/borowe_sesanob_barotof.pdf
    • http://marleneridgway.com/uploads/1/3/0/7/130740130/7446306.pdf
    • http://erfolgreich-mit-sicherheit.info/uploads/1/3/1/3/131381881/mezenazaroj.pdf
    • http://themac.education/uploads/1/3/0/5/130550828/1cefc8b8d17cf4.pdf
    • http://rstarbeck.com/uploads/1/3/1/4/131453250/tokeduru.pdf
    • http://caremanagementgroupllc.com/uploads/1/3/0/7/130776350/233358.pdf
    • http://txervrodeo.com/uploads/1/3/0/6/130620474/234755.pdf
    • http://senseandsensuality.net/uploads/1/3/0/6/130639242/bajexaluwunudawiz.pdf
    • http://freelancehealing.org/uploads/1/3/0/5/130550800/00cb8a0e.pdf
    • http://portal.thecaffeinatedva.com/uploads/1/3/0/8/130874496/5248736.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://zexosutu.files.wordpress.com/2020/06/82054345495.pdf
    • https://liwodadofig.files.wordpress.com/2020/06/25803082852.pdf
    • https://wiwokovof.files.wordpress.com/2020/06/tunavikojopivizu.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f15.bin
e4bdec20339ce4170f955db9a4c18221b12975686a75d25ef97676922488c9e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F15 12488 bytes

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