Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a508b79d5ee68a4…

MALICIOUS

PDF

34.8 KB Created: 2020-06-18 15:18:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 548a7dd80da7a5e752aea1bc23ff7924 SHA-1: e7605e1a43e6b1db8acde13e86d072fbb5eed203 SHA-256: 5a508b79d5ee68a49e9cdbf7f148c1feb117c42f428bcca67f787ecd4e20d1fe
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, identified as a link farm, which is a common technique for SEO manipulation or distributing malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the suspicious nature of the embedded URLs. No scripts were extracted, but the sheer volume of outbound links suggests a high likelihood of malicious intent.

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://cpanel.jacksonvilleartistsguild.org/uploads/1/3/0/6/130639045/130639045.html#numbers+preschool+worksheets
    • http://tomplender.com/uploads/1/3/0/2/130289226/pexoxusebalakuvegowe.pdf
    • http://ericcrain.com/uploads/1/3/0/8/130873975/gedawelalobejofuwe.pdf
    • http://ymc2019.com/uploads/1/3/0/2/130287242/2524492.pdf
    • http://pic-performance.com/uploads/1/3/0/2/130272095/1518787.pdf
    • http://southerntuning.org/uploads/1/3/0/7/130776002/vinupemen.pdf
    • http://chiprelin.com/uploads/1/3/0/2/130273733/5737123.pdf
    • http://goodetranslation.com/uploads/1/3/0/4/130476317/volidozanijefo.pdf
    • http://kemungkinan.org/uploads/1/3/2/6/132681384/c33ea75830.pdf
    • http://everythingconcretehsv.com/uploads/1/3/0/5/130551089/e93f87e33d959.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004ce0.bin
302a98c7f4756829ce790fcac1d8c439a62c0886edadcdedf81fd3513385b654		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CE0 4956 bytes
font_01_sfnt_off00005dcf.bin
47f6f5c02f9937daf9f45fea2fead5f3e9300e3f75f389c431fd23c597f3fc26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DCF 9804 bytes

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