Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdd2037791e53f9d…

MALICIOUS

PDF

44.8 KB Created: 2020-04-10 07:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1ef04d04b7cbd0441e23ed755ebaa5e0 SHA-1: cec4786b67d1374ae4a26fe3779fdb3f99765ada SHA-256: fdd2037791e53f9dfbb802fced14d011cc2d26472698622e2accfe68c6a5d7d6
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML_NYX_PDF_MALICIOUS classifier also strongly indicated maliciousness. The embedded URLs suggest a link farm or SEO manipulation tactic, potentially used to distribute further malicious content or to artificially inflate search engine rankings for malicious sites.

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://charlespaint.life/uploads/1/3/1/4/131454536/131454536.html#nominal+ordinal+data+spss
    • http://bomaboston.com/uploads/1/3/0/3/130379675/559264821.pdf
    • http://uses2018.org/uploads/1/3/0/5/130588556/zejonokurarape-donozodiw-bemijapikimabaf.pdf
    • http://zellabarket.com/uploads/1/3/1/3/131398334/xatoj_nukogupofarevu.pdf
    • http://cleangreenhomesllc.com/uploads/1/3/0/6/130603745/39f28a20fa7b28.pdf
    • http://ucberkeleycounseling.com/uploads/1/3/1/4/131483036/sefex_merup.pdf
    • http://systemofexpression.info/uploads/1/3/0/7/130776027/mitomojasukesade.pdf
    • http://manchesterartstudios.com/uploads/1/3/0/8/130874496/funikigumik.pdf
    • http://6irthday.com/uploads/1/3/1/0/131070364/1875676.pdf
    • http://gamesfurniturefactory.com/uploads/1/3/0/9/130969607/mimokasozedalu-tanod-niwidadefuse.pdf
    • http://ilcastellosantarcangelo.com/uploads/1/3/0/6/130604091/223525.pdf
    • http://givevets.org/uploads/1/3/0/5/130543546/tewabojodibosoto.pdf
    • http://rexcommunicationsllc.com/uploads/1/3/0/2/130289652/6535553.pdf
    • http://craigodesign.com/uploads/1/3/1/4/131437464/8052280.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_off0000869f.bin
20bb6d0b21ff1736ec684d2725d2a4040def97a8b3851fcb4ff9fe6dfa3dc566		 pdf-font-stream PDF embedded font (sfnt) at offset 0x869F 8192 bytes

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