Malicious PDF — malware analysis report

Static analysis result for SHA-256 e76af9590b22da4a…

MALICIOUS

PDF

60.8 KB Created: 2020-04-07 07:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0d26bb2983aa4c92628c9f2adead2747 SHA-1: 56159b02a342250a6b6a4e39b70436c7b6a68a5c SHA-256: e76af9590b22da4ae1878ebc773bfa040de1bbfd930826b6d373cad0ccaf65ff
94 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier as malicious with high confidence. Static analysis revealed a significant number of external links, characteristic of a link farm or SEO poisoning attack, designed to lure users to potentially malicious content. The document body contains garbled text and a URL that appears to be the primary lure.

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://tcsonline.net/uploads/1/3/0/4/130483402/130483402.html#factor+de+integracion+de+salario+para+imss
    • http://ryanmariano.com/uploads/1/3/0/5/130588954/ab296.pdf
    • http://yeoldeenglishbakerydeli.com/uploads/1/3/0/2/130289694/1488774.pdf
    • http://terratechwiki.com/uploads/1/3/0/7/130740375/naxejepib.pdf
    • http://nailawards.com/uploads/1/3/1/4/131407823/pexedusujep.pdf
    • http://acpeinture.ch/uploads/1/3/0/6/130604229/mapesowarag.pdf
    • http://goodcourageproductions.com/uploads/1/3/0/3/130323143/2039760.pdf
    • http://bathdr.com/uploads/1/3/0/2/130270911/wasojopizuzabij.pdf
    • http://alghnadeer.com/uploads/1/3/1/4/131406020/ximisedufinovefivub.pdf
    • http://chrissybtherapy.com/uploads/1/3/0/6/130603850/3c512311.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_off0000c13a.bin
555d83766c95a0083229944d170fd296528492eadefc6ca2ad8cfa73b18cfc62		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC13A 9764 bytes

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