Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ad92df33003ecc9…

MALICIOUS

PDF

38.1 KB Created: 2020-05-05 08:09:59 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a7789d7b188904ec4eab07fa8a1a217e SHA-1: 50c5b0da990fee2503ead5fae6b0a5e981584cf9 SHA-256: 0ad92df33003ecc96085e65e1eee43f79d9e41cb1b5ab38f2320f9c96ab7d97a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which appear to be part of a link farm, suggesting a malicious intent to redirect users to potentially harmful content or for SEO manipulation. The ML classifier strongly indicated maliciousness, and the presence of numerous unknown URLs supports this assessment. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://fit1athletics.com/uploads/1/3/1/4/131437792/131437792.html#graphing+quadratic+equations+day+2+homework+answers
    • http://dukebsa.org/uploads/1/3/0/6/130621444/2526834.pdf
    • http://varelaductwork.com/uploads/1/3/0/7/130739256/9743900.pdf
    • http://decamundo.com/uploads/1/3/0/2/130274032/a28099d9b8.pdf
    • http://nativenerds.org/uploads/1/3/1/4/131437832/gaput-zogiworuli-vodisesolujotu.pdf
    • http://kronetechnologies.com/uploads/1/3/1/3/131398088/206a106.pdf
    • http://tarlifestyle.com/uploads/1/3/0/4/130478110/9978560.pdf
    • http://adventureguide-outdoor.com/uploads/1/3/1/3/131384121/vuxozolegejunavixal.pdf
    • http://anunassi.com/uploads/1/3/0/6/130604737/1276161.pdf
    • http://learneventpainting.com/uploads/1/3/1/6/131606065/648263.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/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_off000068c9.bin
be42558adb9236d6f55e56bf913468277af5d49744bec538d939b98bed1a5132		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68C9 10500 bytes

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